Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

16 files changed, 5796 insertions, 0 deletions

diff --git a/taskcluster/ci/test/awsy.yml b/taskcluster/ci/test/awsy.yml
new file mode 100644
index 0000000000..e730460b35
--- /dev/null
+++ b/taskcluster/ci/test/awsy.yml
@@ -0,0 +1,75 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite: awsy
+    max-run-time: 7200
+    instance-size: xlarge
+    virtualization:
+        by-test-platform:
+            windows.*(?:-shippable)?-qr/.*: virtual-with-gpu
+            default: virtual
+    allow-software-gl-layers: false
+    mozharness:
+        script: awsy_script.py
+        config:
+            by-test-platform:
+                windows.*:
+                    - awsy/taskcluster_windows_config.py
+                macosx.*/opt:
+                    - awsy/macosx_config.py
+                default:
+                    - awsy/linux_config.py
+    tier: default
+    test-manifest-loader: null  # don't load tests in the taskgraph
+
+
+awsy:
+    description: Are we slim yet - tp5 pageset
+    treeherder-symbol: SY(sy)
+    run-on-projects: []
+
+awsy-tp6:
+    description: Are we slim yet - tp6 pageset
+    treeherder-symbol: SY(sy-tp6)
+    run-on-projects:
+        by-test-platform:
+            .*-devedition/.*: []  # don't run on devedition
+            windows.*-32.*/opt: []
+            (linux|windows|mac)(?!.*shippable).*/opt: []
+            default: [integration, mozilla-central, mozilla-beta, mozilla-release]
+    mozharness:
+        extra-options:
+            - --tp6
+
+awsy-dmd:
+    description: Are we slim yet - dmd enabled
+    treeherder-symbol: SY(sy-d)
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --dmd
+
+awsy-base:
+    description: Are we slim yet - about:blank base case
+    treeherder-symbol: SY(ab)
+    run-on-projects:
+        by-test-platform:
+            .*-devedition/.*: []  # don't run on devedition.
+            windows.*-32.*/opt: []
+            (linux|windows|mac)(?!.*shippable).*/opt: []
+            default: [integration, mozilla-central, mozilla-beta, mozilla-release]
+    tier: default
+    mozharness:
+        extra-options:
+            - --base
+
+awsy-base-dmd:
+    description: Are we slim yet - about:blank base case - dmd enabled
+    treeherder-symbol: SY(ab-d)
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --base
+            - --dmd
diff --git a/taskcluster/ci/test/browsertime-desktop.yml b/taskcluster/ci/test/browsertime-desktop.yml
new file mode 100644
index 0000000000..b15fe1ae36
--- /dev/null
+++ b/taskcluster/ci/test/browsertime-desktop.yml
@@ -0,0 +1,721 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    max-run-time:
+        by-test-platform:
+            .*-qr/.*: 2400
+            default: 1800
+    suite: raptor
+    run-on-projects:
+        by-test-platform:
+            linux.*shippable[^-qr].*: [mozilla-central]
+            default: []
+    limit-platforms:
+        by-app:
+            chrome:
+                - .*shippable.*
+            chromium:
+                - .*shippable.*
+            safari:
+                - .*macos.*shippable.*
+            custom-car:
+                - linux.*shippable.*
+                - windows10-64.*shippable.*
+            default: []
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier: 3
+    virtualization: hardware
+    mozharness:
+        script: raptor_script.py
+        config:
+            by-test-platform:
+                macosx.*:
+                    - raptor/mac_config.py
+                windows.*:
+                    - raptor/windows_config.py
+                default:
+                    - raptor/linux_config.py
+        extra-options:
+            - --conditioned-profile=settled
+    fetches:
+        toolchain:
+            by-app:
+                custom-car:
+                    by-test-platform:
+                        # this satisfied taskgraph for now, but once mac/win is implemented
+                        # then linux will be the default
+                        linux.*:
+                            - linux64-custom-car
+                            - linux64-minidump-stackwalk
+                            - linux64-fix-stacks
+                        windows10-64.*:
+                            - win64-custom-car
+                            - win64-minidump-stackwalk
+                            - win64-fix-stacks
+                        default: []
+                default:
+                    by-test-platform:
+                        windows.*-32.*.:
+                            - win32-minidump-stackwalk
+                            - win32-fix-stacks
+                        windows10-64.*:
+                            - win64-minidump-stackwalk
+                            - win64-fix-stacks
+                        macos.*:
+                            - macosx64-minidump-stackwalk
+                            - macosx64-fix-stacks
+                        default:
+                            - linux64-minidump-stackwalk
+                            - linux64-fix-stacks
+
+browsertime-tp6:
+    <<: &tp6-defaults
+        description: Raptor (browsertime) tp6 page-load tests
+        limit-platforms:
+            by-app:
+                chrome:
+                    - .*shippable.*
+                chromium:
+                    - .*shippable.*
+                safari:
+                    - .*macos.*shippable.*
+                custom-car:
+                    - (windows10-64|linux).*shippable.*
+                default: []
+        max-run-time:
+            by-subtest:
+                imgur: 4800
+                default: 4000
+        mozharness:
+            extra-options:
+                by-test-platform:
+                    windows10-64.*shippable.*-qr.*:
+                        - --chimera
+                        - --browsertime-no-ffwindowrecorder
+                        - --conditioned-profile=settled
+                        - --extra-profiler-run
+                        - --extra-summary-methods=geomean
+                    default:
+                        - --chimera
+                        - --conditioned-profile=settled
+                        - --extra-profiler-run
+                        - --extra-summary-methods=geomean
+        run-on-projects:
+            by-subtest:
+                netflix:  # Bug 1756212 - Disable temporarily due to perma on mac
+                    by-app:
+                        firefox:
+                            by-test-platform:
+                                windows.*-32.*: []
+                                (linux|windows10-64).*shippable-qr.*: [trunk, mozilla-beta, mozilla-release]
+                                macosx1015.*shippable-qr.*: []
+                                default: []
+                        default: []
+                default:
+                    by-app:
+                        firefox:
+                            by-test-platform:
+                                windows.*-32.*: []
+                                .*64(?!.*nightlyasrelease).*shippable-qr/.*: [trunk, mozilla-beta, mozilla-release]
+                                default: []
+                        default: []
+        treeherder-symbol: Btime(tp6)
+    raptor:
+        apps: [firefox, chrome, chromium]
+        test: tp6
+        run-visual-metrics: true
+        subtests:
+            - buzzfeed
+            - ebay
+            - espn
+            - expedia
+            - [facebook, fb]
+            - [google-docs, gdocs]
+            - [google-mail, gmail]
+            - [google-search, gsearch]
+            - imdb
+            - imgur
+            - linkedin
+            - microsoft
+            - netflix
+            - nytimes
+            - office
+            - outlook
+            - paypal
+            - pinterest
+            - reddit
+            - tumblr
+            - twitch
+            - wikia
+            - youtube
+    tier:
+        by-app:
+            firefox: 2
+            default: 3
+
+browsertime-responsiveness:
+    <<: *tp6-defaults
+    raptor:
+        apps: [firefox, chrome, chromium]
+        test: tp6
+        run-visual-metrics: true
+        subtests:
+            - cnn-nav
+            - [facebook-nav, fbnav]
+            - [reddit-billgates-ama, rdt-ama]
+            - [reddit-billgates-post-1, rdt-post-1]
+            - [reddit-billgates-post-2, rdt-post-2]
+    mozharness:
+        extra-options:
+            by-test-platform:
+                windows10-.*:
+                    - --cold
+                    - --browsertime-no-ffwindowrecorder
+                    - --conditioned-profile=settled
+                    - --extra-profiler-run
+                default:
+                    - --cold
+                    - --conditioned-profile=settled
+                    - --extra-profiler-run
+    run-on-projects:
+        by-app:
+            firefox:
+                by-test-platform:
+                    windows.*-32.*: []
+                    .*64(?!.*nightlyasrelease).*shippable-qr/.*: [trunk]
+                    default: []
+            default: []
+    tier:
+        by-app:
+            firefox: 2
+            default: 3
+
+browsertime-tp6-essential:
+    <<: *tp6-defaults
+    <<: &tp6-essential-defaults
+        mozharness:
+            extra-options:
+                by-test-platform:
+                    windows10-64.*shippable.*-qr.*:
+                        - --chimera
+                        - --browsertime-no-ffwindowrecorder
+                        - --conditioned-profile=settled
+                        - --collect-perfstats
+                        - --extra-profiler-run
+                        - --extra-summary-methods=geomean
+                    default:
+                        - --chimera
+                        - --conditioned-profile=settled
+                        - --extra-profiler-run
+                        - --extra-summary-methods=geomean
+        raptor:
+            apps: [firefox, chrome, chromium, custom-car]
+            test: tp6
+            run-visual-metrics: true
+            subtests:
+                - amazon
+                - [bing-search, bing]
+                - cnn
+                - fandom
+                - [google-slides, gslides]
+                - instagram
+                - twitter
+                - wikipedia
+                - yahoo-mail
+        run-on-projects:
+            by-app:
+                firefox:
+                    by-test-platform:
+                        windows.*-32.*: []
+                        macosx1100.*shippable.*: [mozilla-central, mozilla-beta]
+                        .*64(?!.*nightlyasrelease).*shippable-qr/.*: [trunk, mozilla-beta, mozilla-release]
+                        default: []
+                default: []
+        tier:
+            by-test-platform:
+                linux1804-64-clang-trunk-qr/opt: 2
+                default:
+                    by-app:
+                        firefox: 1
+                        default: 3
+
+browsertime-tp6-bytecode:
+    <<: *tp6-defaults
+    <<: *tp6-essential-defaults
+    raptor:
+        apps: [firefox]
+        test: tp6
+        run-visual-metrics: true
+        subtests:
+            - amazon
+            - [bing-search, bing]
+            - cnn
+            - fandom
+            - [google-slides, gslides]
+            - instagram
+            - twitter
+            - wikipedia
+            - yahoo-mail
+    run-on-projects:
+        by-app:
+            firefox:
+                by-test-platform:
+                    windows.*-32.*: []
+                    macosx1100.*shippable.*: [mozilla-central, mozilla-beta]
+                    .*64(?!.*nightlyasrelease).*shippable-qr/.*: [trunk, mozilla-beta, mozilla-release]
+                    default: []
+            default: []
+    mozharness:
+        extra-options:
+            by-test-platform:
+                windows10-64.*shippable.*-qr.*:
+                    - --chimera
+                    - --browsertime
+                    - --browsertime-no-ffwindowrecorder
+                    - --conditioned-profile=settled
+                    - --test-bytecode-cache
+                    - --extra-profiler-run
+                default:
+                    - --chimera
+                    - --browsertime
+                    - --conditioned-profile=settled
+                    - --test-bytecode-cache
+                    - --extra-profiler-run
+    tier:
+        by-app:
+            firefox: 2
+            default: 3
+    treeherder-symbol: Btime-cache(tp6)
+
+browsertime-benchmark:
+    description: Raptor (browsertime) Benchmark tests
+    raptor:
+        apps: [firefox, chrome, chromium, safari, custom-car]
+        subtests:
+            by-app:
+                firefox:
+                    - ares6
+                    - [assorted-dom, dom]
+                    - [jetstream2, js2]
+                    - [matrix-react-bench, mrb]
+                    - [motionmark-animometer, mm-a]
+                    - [motionmark-htmlsuite, mm-h]
+                    - [speedometer, sp]
+                    - [speedometer3, sp3]
+                    - [stylebench, sb]
+                    - [sunspider, ss]
+                    - [twitch-animation, tw-a]
+                    - [unity-webgl, ugl]
+                    - [webaudio, wa]
+                safari:
+                    - ares6
+                    - [assorted-dom, dom]
+                    - [jetstream2, js2]
+                    # - [matrix-react-bench, mrb] (Bug 1802922)
+                    - [motionmark-animometer, mm-a]
+                    - [motionmark-htmlsuite, mm-h]
+                    - [speedometer, sp]
+                    - [speedometer3, sp3]
+                    - [stylebench, sb]
+                    - [sunspider, ss]
+                    - [unity-webgl, ugl]
+                    # - [webaudio, wa] (Bug 1802922)
+                custom-car:
+                    - [speedometer, sp]
+                    - [speedometer3, sp3]
+                default:
+                    - ares6
+                    - [assorted-dom, dom]
+                    - [jetstream2, js2]
+                    - [matrix-react-bench, mrb]
+                    - [motionmark-animometer, mm-a]
+                    - [motionmark-htmlsuite, mm-h]
+                    - [speedometer, sp]
+                    - [speedometer3, sp3]
+                    - [stylebench, sb]
+                    - [sunspider, ss]
+                    - [unity-webgl, ugl]
+                    - [webaudio, wa]
+    treeherder-symbol: Btime()
+    tier:
+        by-app:
+            firefox:
+                by-subtest:
+                    motionmark-animometer:
+                        by-test-platform:
+                            linux1804-64-clang-trunk-qr/opt: 2
+                            default: 1
+                    unity-webgl: 3
+                    default:
+                        by-test-platform:
+                            windows10-64-ccov.*/.*: 3
+                            linux64-ccov.*/.*: 3
+                            default: 2
+            default:
+                by-subtest:
+                    unity-webgl: 3
+                    default: 2
+    run-on-projects:
+        by-subtest:
+            speedometer3:
+                by-app:
+                    firefox:
+                        by-test-platform:
+                            windows.*-32.*: []
+                            .*64.*shippable-qr/.*: [trunk, mozilla-release]
+                            .*nightlyasrelease.*: [autoland]
+                            default: []
+                    default: []
+            unity-webgl:
+                by-app:
+                    firefox:
+                        by-test-platform:
+                            windows.*-32.*: []
+                            .*64.*shippable-qr/.*: [trunk, mozilla-release]
+                            default: []
+                    default: []
+            speedometer:
+                by-app:
+                    firefox:
+                        by-test-platform:
+                            windows.*-32.*: []
+                            .*64.*shippable-qr/.*: [trunk, mozilla-beta, mozilla-release]
+                            .*nightlyasrelease.*: [autoland]
+                            default: []
+                    default: []
+            default:
+                by-app:
+                    firefox:
+                        by-test-platform:
+                            windows.*-32.*: []
+                            .*64.*shippable-qr/.*: [trunk, mozilla-beta, mozilla-release]
+                            default: []
+                    default: []
+    max-run-time:
+        by-subtest:
+            ares6: 1500
+            assorted-dom:
+                by-test-platform:
+                    .*-qr/.*: 2100
+                    default: 1500
+            jetstream2: 8000
+            matrix-react-bench: 1500
+            motionmark-htmlsuite: 1500
+            unity-webgl: 1500
+            default: 900
+    mozharness:
+        extra-options:
+            - --extra-profiler-run
+
+browsertime-benchmark-wasm:
+    description: Raptor (browsertime) WASM benchmarks
+    raptor:
+        apps: [firefox, chrome, chromium]  # Safari depends on Bug 1802922
+        subtests:
+            by-app:
+                firefox:
+                    - [wasm-godot, godot]
+                    - [wasm-godot-baseline, godot-b]
+                    - [wasm-godot-optimizing, godot-i]
+                    - [wasm-misc, wm]
+                    - [wasm-misc-baseline, wm-b]
+                    - [wasm-misc-optimizing, wm-i]
+                default:
+                    - [wasm-misc, wm]
+                    - [wasm-godot, godot]
+    treeherder-symbol: Btime()
+    tier: 2
+    run-on-projects:
+        by-app:
+            firefox:
+                by-test-platform:
+                    windows.*-32.*: []
+                    .*64(?!.*nightlyasrelease).*shippable-qr/.*: [mozilla-central, mozilla-release]
+                    default: []
+            default: []
+    max-run-time:
+        by-subtest:
+            wasm-godot: 1500
+            wasm-godot-baseline: 1500
+            default: 900
+    mozharness:
+        extra-options:
+            - --extra-profiler-run
+
+browsertime-youtube-playback:
+    description: Browsertime YouTube Playback on Firefox
+    raptor:
+        apps: [firefox]
+        subtests:
+            by-app:
+                firefox:
+                    - [youtube-playback-av1-sfr, ytp-av1-sfr]
+                    - [youtube-playback-h264-sfr, ytp-h264-sfr]
+                    - [youtube-playback-hfr, ytp-hfr]
+                    - [youtube-playback-vp9-sfr, ytp-vp9-sfr]
+                    - [youtube-playback-widevine-hfr, ytp-widevine-hfr]
+                    - [youtube-playback-widevine-h264-sfr, ytp-widevine-h264-sfr]
+                    - [youtube-playback-widevine-vp9-sfr, ytp-widevine-vp9-sfr]
+    treeherder-symbol: Btime()
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            .*64(?!.*nightlyasrelease).*shippable-qr/.*: [mozilla-central, mozilla-release]
+            default: []
+    tier: 2
+    limit-platforms:
+        by-subtest:
+            youtube-playback-av1-sfr:
+                - macosx1015-64-shippable-qr/opt
+            default: []
+    max-run-time:
+        by-subtest:
+            youtube-playback-hfr: 3600
+            youtube-playback-widevine.*: 3600
+            default: 2700
+
+browsertime-youtube-playback-power:
+    description: Browsertime YouTube Playback on Firefox with power usage tracking
+    raptor:
+        apps: [firefox]
+        subtests:
+            by-app:
+                firefox:
+
+                    - [youtube-playback-h264-1080p30, ytp-h264-1080p30]
+                    - [youtube-playback-h264-1080p60, ytp-h264-1080p60]
+                    - [youtube-playback-h264-full-1080p30, ytp-h264-full-1080p30]
+                    - [youtube-playback-h264-full-1080p60, ytp-h264-full-1080p60]
+                    - [youtube-playback-v9-1080p30, ytp-v9-1080p30]
+                    - [youtube-playback-v9-1080p60, ytp-v9-1080p60]
+                    - [youtube-playback-v9-full-1080p30, ytp-v9-full-1080p30]
+                    - [youtube-playback-v9-full-1080p60, ytp-v9-full-1080p60]
+    treeherder-symbol: Btime()
+    run-on-projects:
+        by-test-platform:
+            macosx.*shippable-qr.*: [mozilla-central]
+            default: []
+    tier: 2
+    max-run-time: 2700
+
+browsertime-tp6-live:
+    <<: *tp6-defaults
+    description: Raptor (browsertime) tp6 on live-sites
+    mozharness:
+        extra-options:
+            - --browser-cycles=15
+            - --chimera
+            - --live-sites
+            - --extra-profiler-run
+    raptor:
+        apps: [firefox, chrome, chromium, safari]
+        test: tp6
+        run-visual-metrics: true
+        subtests:
+            by-app:
+                safari:
+                    - amazon
+                    - [bing-search, bing]
+                    - ebay
+                    - [facebook, fb]
+                    # - fandom (Bug 1802922)
+                    - [google-docs, gdocs]
+                    # - [google-mail, gmail] (Bug 1802922)
+                    - [google-search, gsearch]
+                    - [google-slides, gslides]
+                    - imdb
+                    # - imgur (Bug 1802922)
+                    # - instagram (see bug 1736999)
+                    - linkedin
+                    - microsoft
+                    # - netflix (Bug 1802922)
+                    # - office (site loads blank page if not signed in)
+                    - outlook
+                    - paypal
+                    - pinterest
+                    - reddit
+                    - tumblr
+                    - twitch
+                    - twitter
+                    - wikipedia
+                    # - yahoo-mail (Bug 1802922)
+                    - youtube
+                chrome:
+                    - amazon
+                    - [bing-search, bing]
+                    - ebay
+                    - [facebook, fb]
+                    - fandom
+                    - [google-docs, gdocs]
+                    - [google-mail, gmail]
+                    - [google-search, gsearch]
+                    - [google-slides, gslides]
+                    - imdb
+                    # - imgur (see bugs 1825337 & 1817420)
+                    # - instagram (see bug 1736999)
+                    - linkedin
+                    - microsoft
+                    - netflix
+                    # - office (site loads blank page if not signed in)
+                    - outlook
+                    - paypal
+                    - pinterest
+                    - reddit
+                    - tumblr
+                    - twitch
+                    - twitter
+                    - wikipedia
+                    - yahoo-mail
+                    - youtube
+                default:
+                    - amazon
+                    - [bing-search, bing]
+                    - ebay
+                    - [facebook, fb]
+                    - fandom
+                    - [google-docs, gdocs]
+                    - [google-mail, gmail]
+                    - [google-search, gsearch]
+                    - [google-slides, gslides]
+                    - imdb
+                    - imgur
+                    # - instagram (see bug 1736999)
+                    - linkedin
+                    - microsoft
+                    - netflix
+                    # - office (site loads blank page if not signed in)
+                    - outlook
+                    - paypal
+                    - pinterest
+                    - reddit
+                    - tumblr
+                    - twitch
+                    - twitter
+                    - wikipedia
+                    - yahoo-mail
+                    - youtube
+    run-on-projects: []
+    tier: 3
+    treeherder-symbol: Btime-live(tp6)
+
+browsertime-tp6-live-sheriffed:
+    <<: *tp6-defaults
+    raptor:
+        apps: [firefox]
+        test: tp6
+        run-visual-metrics: true
+        subtests:
+            - cnn
+    description: Raptor (browsertime) tp6 on live-sites
+    mozharness:
+        extra-options:
+            - --browser-cycles=5
+            - --chimera
+            - --live-sites
+            - --extra-profiler-run
+    run-on-projects:
+        by-test-platform:
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows|macosx1015)(?!.*-qr).*: []
+            windows.*-32.*: []
+            default: []
+    tier: 2
+    treeherder-symbol: Btime-live(tp6)
+
+browsertime-tp6-profiling:
+    <<: *tp6-defaults
+    raptor:
+        apps: [firefox]
+        test: tp6
+        run-visual-metrics: true
+        subtests: [amazon]
+    description: Raptor (browsertime) tp6 page-load tests with Gecko Profiling
+    mozharness:
+        extra-options:
+            - --chimera
+            - --gecko-profile
+    run-on-projects:
+        by-test-platform:
+            (linux|windows|macosx1015).*shippable-qr.*: [mozilla-central]
+            default: []
+    tier: 2
+    treeherder-symbol: Btime-Prof(tp6)
+
+browsertime-custom:
+    raptor:
+        apps: [firefox]
+        run-visual-metrics: true
+        subtests: [[process-switch, ps]]
+    description: Raptor (browsertime) custom pageload tests
+    max-run-time: 2700
+    mozharness:
+        extra-options:
+            - --chimera
+            - --extra-profiler-run
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            .*64(?!.*nightlyasrelease).*shippable-qr/.*: [mozilla-central]
+            default: []
+    tier: 1
+    treeherder-symbol: Btime(ps)
+
+browsertime-first-install:
+    raptor:
+        apps: [firefox]
+        run-visual-metrics: true
+        subtests: [welcome]
+    description: Raptor (browsertime) custom pageload tests
+    max-run-time: 2700
+    mozharness:
+        extra-options:
+            - --chimera
+            - --extra-profiler-run
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            .*64(?!.*nightlyasrelease).*shippable-qr/.*: [trunk]
+            default: []
+    tier: 1
+    treeherder-symbol: Btime(welcome)
+
+browsertime-regression-tests:
+    raptor:
+        apps: [firefox]
+        subtests: [[constant-regression, regress-c]]
+    description: Raptor (browsertime) tests for our regression detection system
+    max-run-time: 700
+    run-on-projects: [autoland]
+    limit-platforms:
+        - .*linux(?!.*shippable)(?!.*clang).*
+    mozharness:
+        extra-options:
+            by-test-platform:
+                windows10-64.*shippable.*-qr.*: []
+                default: []
+    tier: 2
+    treeherder-symbol: Btime(regressor)
+
+browsertime-upload:
+    raptor:
+        apps: [firefox, chrome, chromium, safari]
+        subtests:
+            - [upload, upload-h2]
+            - upload-h3
+    description: Raptor (browsertime) http2, http3 file upload performance test
+    max-run-time: 2700
+    run-on-projects:
+        by-app:
+            firefox:
+                by-test-platform:
+                    windows.*-32.*: []
+                    .*64.*shippable-qr/.*: [autoland, mozilla-central]
+                    default: []
+            default: []
+    tier: 3
+    treeherder-symbol: Btime(upload)
+    fetches:
+        fetch:
+            - upload-speed-test-file
diff --git a/taskcluster/ci/test/browsertime-mobile.yml b/taskcluster/ci/test/browsertime-mobile.yml
new file mode 100644
index 0000000000..7340fca083
--- /dev/null
+++ b/taskcluster/ci/test/browsertime-mobile.yml
@@ -0,0 +1,380 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    max-run-time: 3600
+    suite: raptor
+    variants:
+        - geckoview-no-fission
+    run-on-projects: []
+    tier: 3
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    target:
+        by-app:
+            fenix:
+                by-test-platform:
+                    android-hw.*-aarch64.*/.*:
+                        index: mobile.v3.firefox-android.apks.fenix-nightly.latest.arm64-v8a
+                        name: build/fenix/arm64-v8a/target.apk
+                    default:
+                        index: mobile.v3.firefox-android.apks.fenix-nightly.latest.armeabi-v7a
+                        name: build/fenix/armeabi-v7a/target.apk
+            refbrow:
+                by-test-platform:
+                    android-hw.*-aarch64.*/.*:
+                        index: mobile.v2.reference-browser.raptor.latest.arm64-v8a
+                        name: target.arm64-v8a.apk
+                    default:
+                        index: mobile.v2.reference-browser.raptor.latest.armeabi-v7a
+                        name: target.armeabi-v7a.apk
+            default: geckoview_example.apk
+    virtualization: hardware
+    raptor:
+        activity:
+            by-app:
+                fenix: org.mozilla.fenix.IntentReceiverActivity
+                geckoview: org.mozilla.geckoview_example.GeckoViewActivity
+                refbrow: org.mozilla.reference.browser.BrowserTestActivity
+                default: None
+        binary-path:
+            by-app:
+                fenix: org.mozilla.fenix
+                geckoview: org.mozilla.geckoview_example
+                refbrow: org.mozilla.reference.browser.raptor
+                default: None
+    mozharness:
+        script: raptor_script.py
+        config:
+            - raptor/android_hw_config.py
+        extra-options:
+            # Bug 1635749, disable window recorder temporarily
+            - --browsertime-no-ffwindowrecorder
+            - --conditioned-profile=settled
+    optimization:
+        skip-unless-backstop: null
+    limit-platforms:
+        by-app:
+            chrome-m:
+                - .*shippable-qr.*
+            default: []
+
+browsertime-tp6m:
+    <<: &tp6m-defaults
+        description: Raptor (browsertime) tp6 page-load tests on android
+        max-run-time:
+            by-subtest:
+                reddit:
+                    by-app:
+                        geckoview: 7200
+                        default: 3600
+                imdb:
+                    by-app:
+                        geckoview: 7200
+                        default: 3600
+                default: 3600
+        mozharness:
+            extra-options:
+                - --chimera
+                - --extra-summary-methods=geomean
+        tier:
+            by-app:
+                geckoview: 1
+                refbrow: 2
+                default: 3
+        treeherder-symbol: Btime(tp6m)
+    raptor:
+        apps: [geckoview, fenix, chrome-m, refbrow]
+        run-visual-metrics: true
+        test: tp6m
+        subtests:
+            - amazon
+            - bing
+            - [bing-search-restaurants, bing-s-r]
+            - booking
+            - cnn
+            - [cnn-ampstories, cnn-amp]
+            - dailymail
+            - [ebay-kleinanzeigen, ebay-k]
+            - [ebay-kleinanzeigen-search, ebay-k-s]
+            - [facebook-cristiano, fb-cris]
+            - [google-maps, gmaps]
+            - [google-search-restaurants, gsearch-r]
+            - instagram
+            - imdb
+            - reddit
+            - sina
+            - [stackoverflow, stacko]
+            - web-de
+            - wikipedia
+            - youtube
+    run-on-projects:
+        by-app:
+            geckoview:
+                by-variant:
+                    geckoview-no-fission:
+                        by-test-platform:
+                            android-hw-(g5|a51).*shippable-qr.*: [trunk-only]
+                            default: []
+                    default:
+                        by-subtest:
+                            wikipedia:
+                                by-test-platform:
+                                    android-hw-(g5|a51).*shippable-qr.*: []
+                                    default: []
+                            google-search-restaurants:
+                                by-test-platform:
+                                    android-hw-(g5|a51).*shippable-qr.*: []
+                                    default: []
+                            default:
+                                by-test-platform:
+                                    android-hw-(g5|a51).*shippable-qr.*: []
+                                    default: []
+            default: []
+
+browsertime-tp6m-essential:
+    <<: *tp6m-defaults
+    run-without-variant: false
+    raptor:
+        apps: [geckoview, fenix, chrome-m, refbrow]
+        run-visual-metrics: true
+        test: tp6m
+        subtests:
+            - allrecipes
+            - [amazon-search, amazon-s]
+            - espn
+            - facebook
+            - google
+            - [microsoft-support, micros-sup]
+            - [youtube-watch, youtube-w]
+    run-on-projects:
+        by-app:
+            geckoview:
+                by-subtest:
+                    allrecipes:
+                        by-test-platform:
+                            android-hw-(g5|a51).*shippable.*: [trunk]
+                            default: []
+                    default:
+                        by-test-platform:
+                            android-hw-(g5|a51).*shippable.*: [trunk-only]
+                            default: []
+            default: []
+    tier:
+        by-app:
+            geckoview: 1
+            refbrow: 2
+            default: 3
+
+browsertime-youtube-playback-mobile:
+    description: Browsertime YouTube Playback on Android
+    treeherder-symbol: Btime(ytp)
+    run-without-variant: false
+    raptor:
+        apps: [fenix, geckoview, refbrow]
+        subtests:
+            by-test-platform:
+                android-hw-(g5|a51).*:
+                    - [youtube-playback-h264-sfr, ytp-h264-sfr]
+                    - [youtube-playback-hfr, ytp-hfr]
+                    # Bug 1699469 - Disabled until a crash is fixed.
+                    # - [youtube-playback-widevine-h264-sfr, ytp-widevine-h264-sfr]
+                    # - [youtube-playback-widevine-hfr, ytp-widevine-hfr]
+        test-url-param:
+            by-subtest:
+                youtube-playback-h264-sfr:  # remove high resolution tests
+                    exclude=1,2,
+                    23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38
+                youtube-playback-hfr:
+                    by-test-platform:
+                        android-hw-(g5|a51).*:  # remove VP9(1-34) and AV1(51-74) tests
+                            exclude=1,2,
+                            3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,
+                            51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74
+                        default: ""
+                youtube-playback-widevine-hfr:
+                    by-test-platform:
+                        android-hw-(g5|a51).*:  # remove VP9(1-34) tests
+                            exclude=1,2,
+                            3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
+                        default: ""
+                default: ""
+    run-on-projects:
+        by-app:
+            geckoview:
+                by-test-platform:
+                    android-hw-(g5|a51).*shippable.*: [mozilla-central]
+                    default: []
+            default: []
+    max-run-time: 3600
+
+browsertime-tp6m-live:
+    <<: *tp6m-defaults
+    run-without-variant: false
+    raptor:
+        apps: [chrome-m, fenix, geckoview]
+        run-visual-metrics: true
+        test: tp6m
+        subtests:
+            - allrecipes
+            - amazon
+            - [amazon-search, amazon-s]
+            - bing
+            - [bing-search-restaurants, bing-s-r]
+            - booking
+            - booking-sf
+            - cnn
+            - [cnn-ampstories, cnn-amp]
+            - dailymail
+            - discord
+            - [ebay-kleinanzeigen, ebay-k]
+            - [ebay-kleinanzeigen-search, ebay-k-s]
+            - espn
+            - expedia
+            - facebook
+            - [facebook-cristiano, fb-cris]
+            - [fashionbeans, fashbea]
+            - google
+            - [google-accounts, gacc]
+            - [google-maps, gmaps]
+            - [google-search-restaurants, gsearch-r]
+            - instagram
+            - imdb
+            - [imdb-firefox, imdb-f]
+            - [medium-article, medium]
+            - [microsoft-support, micros-sup]
+            - nytimes
+            - [people-article, people]
+            - reddit
+            - [reddit-thread, reddit-thr]
+            - rumble-fox
+            - [stackoverflow, stacko]
+            - [stackoverflow-question, stack-q]
+            - [urbandictionary-define, urbict-def]
+            - web-de
+            - [wikia-marvel, wikia-m]
+            - wikipedia
+            - youtube
+            - [youtube-watch, youtube-w]
+    mozharness:
+        extra-options:
+            - --live-sites
+            - --chimera
+    run-on-projects:
+        by-subtest:
+            cnn-ampstories:
+                by-app:
+                    geckoview:
+                        by-test-platform:
+                            android-hw-(g5|a51).*shippable-qr.*: [autoland]
+                            default: []
+                    default: []
+            default: []
+    tier: 3
+    treeherder-symbol: Btime-live(tp6m)
+
+browsertime-tp6m-profiling:
+    description: Raptor (browsertime) tp6 page-load tests on android with Gecko profiling
+    run-without-variant: false
+    raptor:
+        apps: [geckoview]
+        test: tp6m
+        subtests: [amazon, youtube]
+    treeherder-symbol: Btime-Prof(tp6m)
+    mozharness:
+        script: raptor_script.py
+        config:
+            - raptor/android_hw_config.py
+        extra-options:
+            - --chimera
+            - --gecko-profile
+    run-on-projects:
+        by-test-platform:
+            android-hw-(a51).*aarch64-shippable-qr/opt: [mozilla-central]
+            default: []
+
+browsertime-speedometer-mobile:
+    description: Browsertime Speedometer on Android
+    run-without-variant: false
+    raptor:
+        apps: [geckoview, fenix, chrome-m]
+    tier:
+        by-app:
+            fenix: 1
+            default: 3
+    run-on-projects:
+        by-app:
+            refbrow: []
+            geckoview:
+                by-test-platform:
+                    android-hw-(g5|a51).*shippable-qr.*: [trunk]
+                    default: []
+            default: []
+    treeherder-symbol: Btime(sp)
+    mozharness:
+        extra-options:
+            - --test=speedometer
+
+browsertime-speedometer3-mobile:
+    description: Browsertime Speedometer 3 on Android
+    run-without-variant: false
+    raptor:
+        apps: [geckoview, fenix, chrome-m]
+    tier:
+        by-app:
+            fenix: 2
+            geckoview: 2
+            default: 3
+    run-on-projects:
+        by-app:
+            refbrow: []
+            geckoview:
+                by-test-platform:
+                    android-hw-a51.*shippable-qr.*: [trunk-only]
+                    default: []
+            default: []
+    treeherder-symbol: Btime(sp3)
+    mozharness:
+        extra-options:
+            - --test=speedometer3
+
+browsertime-unity-webgl-mobile:
+    description: Browsertime Unity WebGL on Android
+    run-without-variant: false
+    raptor:
+        apps: [geckoview, refbrow, fenix, chrome-m]
+    treeherder-symbol: Btime(ugl)
+    run-on-projects:
+        by-app:
+            refbrow: []
+            geckoview:
+                by-test-platform:
+                    android-hw-a51-.*aarch64-shippable-qr.*: [trunk-only]
+                    default: []
+            default:
+                by-test-platform:
+                    android-hw-a51-.*aarch64-shippable-qr.*: [mozilla-central]
+                    default: []
+    max-run-time:
+        by-test-platform:
+            anrdroid-hw-a51.*: 1500
+            default: 900
+    mozharness:
+        extra-options:
+            - --test=unity-webgl
+
+browsertime-power:
+    description: Browsertime Power Usage Tests on Android
+    run-without-variant: false
+    raptor:
+        apps: [geckoview, fenix, refbrow]
+        subtests:
+            - idle
+            - idle-bg
+            - [speedometer, sp]
+    tier: 2
+    run-on-projects: []
+    treeherder-symbol: Btime-P(power)
+    mozharness:
+        extra-options:
+            - --power-test
diff --git a/taskcluster/ci/test/compiled.yml b/taskcluster/ci/test/compiled.yml
new file mode 100644
index 0000000000..864e1ca6c4
--- /dev/null
+++ b/taskcluster/ci/test/compiled.yml
@@ -0,0 +1,138 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    run-without-variant: false
+    variants:
+        - 1proc
+    virtualization: virtual
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                android-hw.*: android_hardware_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                android-hw.*:
+                    - android/android_common.py
+                    - android/android_hw.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+    supports-artifact-builds: false
+
+cppunit:
+    description: "CPP Unit Tests"
+    suite: cppunittest
+    treeherder-symbol: cppunit
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-test_runner.apk
+            default: null
+    tier: default
+    run-on-projects:
+        by-variant:
+            1proc:
+                by-test-platform:
+                    .*wayland.*: []
+                    default: built-projects
+            default: []
+
+gtest:
+    description: "GTests run"
+    suite: gtest
+    treeherder-symbol: GTest
+    instance-size: xlarge
+    run-on-projects:
+        by-variant:
+            1proc:
+                by-test-platform:
+                    .*android.*: built-projects
+                    .*(devedition|tsan|wayland).*: []
+                    linux1804-32-qr/opt: []  # try only, shippable on m-c
+                    linux1804-32-qr/debug: ['mozilla-central']  # try and m-c
+                    linux1804-32-shippable-qr/opt: ['mozilla-central']  # try and m-c
+                    default: built-projects
+            default: []
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-test_runner.apk
+            default: null
+    tier: default
+
+jittest:
+    description: "JIT Test run"
+    suite: jittest
+    treeherder-symbol: Jit
+    run-on-projects:
+        by-variant:
+            1proc:
+                by-test-platform:
+                    android-hw-.*-aarch64-qr/debug: ['mozilla-central', 'release']
+                    android-hw-.*-arm7-qr/debug: ['mozilla-central', 'release']
+                    default: built-projects
+            default: []
+    chunks:
+        by-test-platform:
+            windows.*-ccov-qr/opt: 8
+            windows.*: 1
+            macosx.*/opt: 1
+            macosx.*/debug: 3
+            android.*: 10
+            default: 6
+    max-run-time:
+        by-test-platform:
+            windows.*-ccov.*/.*: 7200
+            macosx.*-ccov.*/.*: 7200
+            android-hw.*: 5400
+            default: 3600
+    mozharness:
+        chunked:
+            by-test-platform:
+                windows.*: false
+                macosx.*: false
+                default: true
+    target:
+        by-test-platform:
+            android-.*: geckoview-test_runner.apk
+            default: null
+    tier:
+        by-test-platform:
+            android-hw.*: 2
+            default: default
+
+jittest-all:
+    description: "JIT Test run with all flags for android arm7 opt"
+    suite: jittest
+    treeherder-symbol: Jit
+    run-on-projects:
+        by-test-platform:
+            android-hw-.*-arm7(?:-shippable)?-qr/.*: ['mozilla-central', 'release']
+            default: []
+    chunks: 10
+    max-run-time: 3600
+    mozharness:
+        chunked: true
+        extra-options:
+            by-test-platform:
+                android.*:
+                    - --jittest-flags=all
+                default: None
+    target:
+        by-test-platform:
+            android-.*: geckoview-test_runner.apk
+            default: null
+    tier:
+        by-test-platform:
+            android-hw.*: 2
+            default: default
diff --git a/taskcluster/ci/test/firefox-ui.yml b/taskcluster/ci/test/firefox-ui.yml
new file mode 100644
index 0000000000..b295ec94d4
--- /dev/null
+++ b/taskcluster/ci/test/firefox-ui.yml
@@ -0,0 +1,30 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite:
+        category: firefox-ui
+    max-run-time: 5400
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    run-on-projects:
+        by-test-platform:
+            .*wayland.*: []
+            default: built-projects
+    mozharness:
+        script: firefox_ui_tests.py
+        config:
+            by-test-platform:
+                windows.*:
+                    - firefox_ui_tests/taskcluster_windows.py
+                macosx.*:
+                    - firefox_ui_tests/taskcluster.py
+                    - firefox_ui_tests/taskcluster_mac.py
+                linux.*:
+                    - firefox_ui_tests/taskcluster.py
+                    - remove_executables.py
+
+firefox-ui-functional:
+    description: "Firefox-ui-tests functional run"
+    treeherder-symbol: Fxfn(en-US)
+    tier: 2
diff --git a/taskcluster/ci/test/kind.yml b/taskcluster/ci/test/kind.yml
new file mode 100644
index 0000000000..5c0a5671b5
--- /dev/null
+++ b/taskcluster/ci/test/kind.yml
@@ -0,0 +1,82 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+loader: gecko_taskgraph.loader.test:loader
+
+kind-dependencies:
+    - build
+    - build-signing
+    - repackage-signing-shippable-l10n-msix
+    - repackage-signing-msix
+    - repackage-signing
+    - repackage
+    - fetch
+    - toolchain
+
+transforms:
+    - gecko_taskgraph.transforms.test:transforms
+    - gecko_taskgraph.transforms.job:transforms
+    - gecko_taskgraph.transforms.task:transforms
+
+# Each stanza in a file pointed to by 'jobs-from' describes a particular test
+# suite or sub-suite. These are processed through the transformations described
+# above to produce a bunch of tasks. See the schema in
+# `taskcluster/gecko_taskgraph/transforms/test/__init__.py` for a description of the fields
+# used in these files.
+
+# Adding a new test type or running tests on a new platform? Be sure to review
+# https://wiki.mozilla.org/Sheriffing/Job_Visibility_Policy
+
+jobs-from:
+    - awsy.yml
+    - browsertime-desktop.yml
+    - browsertime-mobile.yml
+    - compiled.yml
+    - firefox-ui.yml
+    - marionette.yml
+    - misc.yml
+    - mochitest.yml
+    - reftest.yml
+    - talos.yml
+    - web-platform.yml
+    - xpcshell.yml
+
+job-defaults:
+    attributes:
+        retrigger: true
+    require-signed-extensions:
+        by-release-type:
+            release|esr.*: true
+            beta:
+                by-test-platform:
+                    .*-devedition/.*: false
+                    default: true
+            default: false
+    mozharness:
+        requires-signed-builds:
+            by-test-platform:
+                macosx1100.*: true
+                windows1.*:
+                    by-variant:
+                        msix: true
+                        default: false
+                default: false
+    fetches:
+        toolchain:
+            by-test-platform:
+                win.*:
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                macosx.*:
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                android-em-7.*:
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - android-emulator-linux
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                default:
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
diff --git a/taskcluster/ci/test/marionette.yml b/taskcluster/ci/test/marionette.yml
new file mode 100644
index 0000000000..b138c806a3
--- /dev/null
+++ b/taskcluster/ci/test/marionette.yml
@@ -0,0 +1,55 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite: marionette
+    mozharness:
+        script: marionette.py
+        config:
+            by-test-platform:
+                macosx.*:
+                    - marionette/prod_config.py
+                    - marionette/mac_taskcluster_config.py
+                windows.*:
+                    - marionette/windows_taskcluster_config.py
+                default:
+                    - marionette/prod_config.py
+                    - remove_executables.py
+        extra-options:
+            - --setpref=toolkit.asyncshutdown.log=true
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier:
+        by-variant:
+            headless: 2
+            default: default
+    variants:
+        - webrender-sw
+        - headless
+    run-on-projects:
+        by-variant:
+            headless:
+                by-test-platform:
+                    (linux.*64)(-shippable)?-qr/opt: built-projects
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    .*/debug: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    .*(tsan|wayland).*: []
+                    default: built-projects
+    virtualization: virtual
+
+marionette:
+    description: "Marionette unittest run"
+    treeherder-symbol: Mn
+    max-run-time:
+        by-test-platform:
+            .*asan.*: 5400
+            .*ccov.*: 3600
+            .*debug.*: 3600
+            default: 2700
+    instance-size: default
+    chunks: 1
diff --git a/taskcluster/ci/test/misc.yml b/taskcluster/ci/test/misc.yml
new file mode 100644
index 0000000000..e6a3bbb1c1
--- /dev/null
+++ b/taskcluster/ci/test/misc.yml
@@ -0,0 +1,272 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    test-manifest-loader: null  # don't load tests in the taskgraph
+
+geckoview-junit:
+    description: "Geckoview junit run"
+    suite: geckoview-junit
+    variants: ["geckoview-fission", "no-fission"]
+    treeherder-symbol: gv-junit
+    loopback-video: true
+    target: geckoview-androidTest.apk
+    max-run-time: 3600
+    run-on-projects:
+        by-variant:
+            geckoview-fission: ['trunk']
+            no-fission: built-projects
+            default: []
+    tier: default
+    mozharness:
+        script: android_emulator_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+        extra-options:
+            - --test-suite=geckoview-junit
+
+telemetry-tests-client:
+    description: "Telemetry tests client run"
+    suite: telemetry-tests-client
+    treeherder-symbol: tt(c)
+    run-on-projects:
+        by-test-platform:
+            .*wayland.*: []
+            default: built-projects
+    max-run-time: 1200
+    tier: default
+    mozharness:
+        script: telemetry/telemetry_client.py
+        config:
+            by-test-platform:
+                linux.*:
+                    - remove_executables.py
+                windows.*: []
+                macosx.*: []
+
+test-verify:
+    description: "Extra verification of tests modified on this push"
+    suite: test-verify
+    treeherder-symbol: TV
+    loopback-video: true
+    max-run-time: 10800
+    allow-software-gl-layers: false
+    variants:
+        - no-fission
+    run-on-projects:
+        by-variant:
+            no-fission:
+                by-test-platform:
+                    # do not run on ccov or asan or shippable or wayland
+                    .*(-ccov|-asan|-shippable|-wayland).*: []
+                    # we prefer -qr platforms with fis, no need to run on both
+                    (?!.*(-ccov|-asan|-shippable))(?!.*-qr).*: []
+                    # do not run on mozilla-central, beta or release: usually just confirms earlier results
+                    android.*: ['integration']
+                    default: []
+            default:
+                by-test-platform:
+                    # do not run on ccov or asan or shippable or wayland
+                    .*(-ccov|-asan|-shippable|-wayland).*: []
+                    # we prefer -qr platforms with fis, no need to run on both
+                    (?!.*(-ccov|-asan|-shippable))(?!.*-qr).*: []
+                    # do not run on mozilla-central, beta or release: usually just confirms earlier results
+                    android.*: []
+                    default: ['integration']
+    built-projects-only: true
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-test_runner.apk
+            default: null
+    optimization:
+        test-verify: ["test-verify"]
+    tier: 2
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+        extra-options:
+            - --verify
+    fetches:
+        toolchain:
+            by-test-platform:
+                linux.*:
+                    - linux64-node
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                macosx.*:
+                    - macosx64-node
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*-64.*:
+                    - win64-node
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                win.*32.*:
+                    - win32-node
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                android-em-7.*:
+                    - android-sdk-linux
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - linux64-node
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+
+test-verify-gpu:
+    description: "Extra verification of tests modified on this push on gpu instances"
+    suite:
+        category: test-verify
+        name: test-verify-gpu
+    treeherder-symbol: TVg
+    loopback-video: true
+    virtualization: virtual-with-gpu
+    max-run-time: 10800
+    allow-software-gl-layers: false
+    run-on-projects:
+        by-test-platform:
+            # do not run on ccov or asan or shippable or wayland
+            .*(-ccov|-asan|-shippable|-wayland).*: []
+            # do not run on mozilla-central, beta or release: usually just confirms earlier results
+            linux.*: ['integration']
+            default: []
+    built-projects-only: true
+    optimization:
+        test-verify: ["test-verify-gpu"]
+    tier: 2
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+        extra-options:
+            - --verify
+            - --gpu-required
+
+test-coverage:
+    description: "Per-test coverage"
+    suite: test-coverage
+    treeherder-symbol: TC
+    loopback-video: true
+    instance-size: default
+    max-run-time: 10800
+    allow-software-gl-layers: false
+    run-on-projects:
+        by-test-platform:
+            .*-ccov.*/.*: built-projects
+            default: []
+    tier: 2
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+        extra-options:
+            - --per-test-coverage
+    fetches:
+        toolchain:
+            by-test-platform:
+                linux.*:
+                    - linux64-node
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                macosx.*:
+                    - macosx64-node
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*-64.*:
+                    - win64-node
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                win.*32.*:
+                    - win32-node
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                android-em-7.*:
+                    - android-sdk-linux
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - linux64-node
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+
+test-coverage-gpu:
+    description: "Per-test coverage for tests that require gpu instances"
+    suite: test-coverage
+    treeherder-symbol: TCg
+    loopback-video: true
+    virtualization: virtual-with-gpu
+    instance-size: default
+    max-run-time: 10800
+    allow-software-gl-layers: false
+    run-on-projects:
+        by-test-platform:
+            # only run on mozilla-central and try.
+            .*-ccov.*/.*: ['mozilla-central']
+            default: []
+    tier:
+        by-test-platform:
+            windows.*asan.*: 3
+            default: 2
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+        extra-options:
+            - --per-test-coverage
+            - --gpu-required
diff --git a/taskcluster/ci/test/mochitest.yml b/taskcluster/ci/test/mochitest.yml
new file mode 100644
index 0000000000..b4439a6e47
--- /dev/null
+++ b/taskcluster/ci/test/mochitest.yml
@@ -0,0 +1,1090 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite:
+        category: mochitest
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-test_runner.apk
+            android-hw.*: geckoview-test_runner.apk
+            windows11-64-2009.*:
+                by-variant:
+                    msix: target.installer.msix
+                    default: null
+            default: null
+    tier:
+        by-variant:
+            xorigin:
+                by-test-platform:
+                    linux.*64.*-qr/debug: 1
+                    default: 2
+            default:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: 3
+                    default: default
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                android-hw.*: android_hardware_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                android-hw.*:
+                    - android/android_common.py
+                    - android/android_hw.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+
+mochitest-plain:
+    description: "Mochitest plain run"
+    treeherder-symbol: M()
+    schedules-component: mochitest-plain
+    loopback-video: true
+    virtualization: virtual
+    variants:
+        - aab+no-fission
+        - conditioned_profile
+        - xorigin
+        - no-fission
+        - socketprocess_networking
+        - webrender-sw+no-fission
+        - webrender-sw
+        - headless
+        - headless+socketprocess_networking
+        - http3
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            conditioned_profile:
+                by-test-platform:
+                    .*(asan|ccov|wayland).*: []
+                    linux1804-64(-shippable)?-qr/opt: ['trunk']
+                    windows11-64.*(-shippable)?-qr/opt: ['trunk']
+                    default: []
+            xorigin:
+                by-test-platform:
+                    .*(asan|wayland).*: []
+                    windows.*ccov.*: []
+                    (linux.*64|macosx.*64|windows11.*)(-shippable)?-qr/(opt|debug): ['trunk']
+                    windows.*64-ccov-qr/opt: ['mozilla-central']
+                    linux.*64-ccov-qr/opt: ['mozilla-central']
+                    default: []
+            socketprocess_networking:
+                by-test-platform:
+                    .*(asan|ccov|wayland).*: []
+                    (linux.*64|macosx.*64|windows11-64.*)(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux.*asan.*: ['trunk']
+                    linux.*64(-shippable)?-qr/(opt|debug): ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux1804-64-qr/debug: built-projects
+                    default: []
+            aab+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    default: []
+            headless:
+                by-test-platform:
+                    .*wayland.*: []
+                    linux1804-64.*: ['mozilla-central']
+                    default: []
+            headless+socketprocess_networking:
+                by-test-platform:
+                    .*wayland.*: []
+                    linux1804-64.*: ['mozilla-central']
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    android.*: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            http3:
+                by-test-platform:
+                    linux1804-64-qr/debug: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    android.*: built-projects
+                    .*wayland.*: []
+                    default: built-projects
+    chunks:
+        by-test-platform:
+            android-em-7.*: 4
+            linux.*/debug: 16
+            linux.*64-asan/opt: 10
+            linux.*64-tsan-qr/opt: 20
+            linux.*64-.*cov/opt: 10
+            windows.*-ccov.*/.*: 10
+            macosx.*64-ccov.*/.*: 10
+            default: 5
+    instance-size:
+        by-test-platform:
+            linux.*64-tsan-qr/opt: xlarge  # runs out of memory using 8GB
+            default: default
+    max-run-time: 5400
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        extra-options:
+            by-test-platform:
+                android-em.*:
+                    - --test-suite=mochitest-plain
+                default: []
+        chunked:
+            by-test-platform:
+                android-em.*: false
+                default: true
+    fetches:
+        toolchain:
+            by-test-platform:
+                linux.*:
+                    - linux64-node-12
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                macosx.*:
+                    - macosx64-node-12
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*-64.*:
+                    - win64-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                win.*32.*:
+                    - win32-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                android-em-7.*:
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - android-emulator-linux
+                    - linux64-node-12
+                    - linux64-minidump-stackwalk
+
+mochitest-a11y:
+    description: "Mochitest a11y run"
+    treeherder-symbol: M(a11y)
+    schedules-component: mochitest-a11y
+    test-manifest-loader: default  # ensure we don't run with manifest-scheduling
+    loopback-video: true
+    run-without-variant: false
+    variants:
+        - 1proc
+        - socketprocess_networking+1proc
+        - webrender-sw+1proc
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            socketprocess_networking+1proc:
+                by-test-platform:
+                    linux.*64-qr/debug: ['autoland', 'mozilla-central']
+                    default: []
+            webrender-sw+1proc:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            1proc:
+                by-test-platform:
+                    .*wayland.*: []
+                    default: built-projects
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+    mozharness:
+        mochitest-flavor: a11y
+
+mochitest-browser-chrome:
+    description: "Mochitest browser-chrome run"
+    suite:
+        name: mochitest-browser-chrome
+    treeherder-symbol: M(bc)
+    schedules-component: mochitest-browser-chrome
+    loopback-video: true
+    variants:
+        - webrender-sw
+        - webrender-sw+a11y-checks
+        - socketprocess_networking
+        - msix
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    linux.*64(-asan)?-qr/(opt|debug): ['all']
+                    linux.*64-tsan-qr/opt: built-projects
+                    linux.*64-shippable-qr/opt: ['release']
+                    linux.*64(-shippable)?-qr/opt: built-projects
+                    linux.*64-devedition-qr/opt: built-projects
+                    windows1.*-64.*-qr/debug: built-projects
+                    default: []
+            webrender-sw+a11y-checks:
+                by-test-platform:
+                    linux.*64(-shippable)?-qr/opt: ['trunk']
+                    default: []
+            socketprocess_networking:
+                by-test-platform:
+                    .*asan.*: []
+                    .*ccov.*: []
+                    (linux.*64|macosx.*64|windows1.*-64.*)(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    default: []
+            msix:
+                by-test-platform:
+                    windows11-64-2009-qr/debug: built-projects
+                    windows11-64-2009(-shippable)?-qr/opt: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    linux.*: []  # linux runs M-swr(bc), not M(bc)
+                    default: built-projects
+    tier:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    linux.*64(-asan|-shippable)?-qr/(opt|debug): 1
+                    default: default
+            default: default
+    chunks:
+        by-test-platform:
+            linux.*-qr/debug: 16
+            linux.*64-asan-qr/opt: 16
+            linux.*64-tsan-qr/opt: 32
+            macosx.*64/debug: 16
+            windows.*-ccov.*/.*: 14
+            windows.*-asan-qr/opt: 14
+            windows7-32.*: 20
+            windows.*32-qr/debug: 12
+            default: 7
+    max-run-time:
+        by-variant:
+            msix: 5400
+            socketprocess_networking:
+                by-test-platform:
+                    linux.*-qr/debug: 7200
+                    default: 5400
+            default:
+                by-test-platform:
+                    linux.*64-ccov.*/.*: 9000
+                    linux.*64-tsan-qr/opt: 10800
+                    linux.*-qr/opt: 5400
+                    macosx.*64-ccov.*/.*: 10800
+                    windows.*-ccov.*/.*: 10800
+                    windows.*-asan-qr/opt: 5400
+                    .*/debug: 5400
+                    default: 3600
+    mozharness:
+        mochitest-flavor: browser
+        chunked: true
+    # Bug 1281241: migrating to m3.large instances
+    instance-size:
+        by-test-platform:
+            linux.*64-tsan-qr/opt: xlarge  # runs out of memory using 8GB
+            default: default
+    allow-software-gl-layers: false
+
+mochitest-browser-a11y:
+    description: "Mochitest browser-a11y run"
+    suite:
+        name: mochitest-browser-a11y
+    treeherder-symbol: M(ba)
+    schedules-component: mochitest-browser-a11y
+    loopback-video: true
+    run-on-projects:
+        by-test-platform:
+            android.*: []
+            .*wayland.*: []
+            default: built-projects
+    tier: default
+    max-run-time:
+        by-test-platform:
+            .*tsan.*: 2700
+            linux.*/debug: 2700
+            default: 1800
+    mozharness:
+        mochitest-flavor: browser
+        chunked:
+            by-test-platform:
+                .*tsan.*: true
+                default: false
+    chunks:
+        by-test-platform:
+            .*tsan.*: 2
+            default: 1
+    instance-size: default
+    allow-software-gl-layers: false
+    virtualization: virtual
+
+mochitest-browser-media:
+    description: "Mochitest browser media"
+    suite:
+        name: mochitest-browser-media
+    treeherder-symbol: M(mda-bc)
+    schedules-component: mochitest-browser-media
+    loopback-video: true
+    test-manifest-loader: null
+    variants: ["wmf-media-engine"]
+    run-on-projects:
+        by-variant:
+            wmf-media-engine:
+                by-test-platform:
+                    .*asan.*: []
+                    windows11-64.*/debug: []  # Bug 1805736
+                    windows1.*-64.*: ['autoland', 'mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    tier: default
+    max-run-time:
+        by-test-platform:
+            .*tsan.*: 1800
+            default: 1200
+    mozharness:
+        mochitest-flavor: browser
+    instance-size: default
+    allow-software-gl-layers: false
+    virtualization: virtual
+
+browser-screenshots:
+    description: "Browser Screenshots"
+    suite:
+        name: mochitest-browser-chrome-screenshots
+    treeherder-symbol: M(ss)
+    loopback-video: true
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    variants: ["no-fission"]
+    run-on-projects:
+        by-test-platform:
+            linux1804-64.*/opt: ['trunk']
+            default: []
+    max-run-time: 3600
+    mozharness:
+        mochitest-flavor: browser
+    allow-software-gl-layers: false
+
+mochitest-chrome:
+    description: "Mochitest chrome run"
+    treeherder-symbol: M(c)
+    schedules-component: mochitest-chrome
+    loopback-video: true
+    run-without-variant: false
+    variants:
+        - 1proc
+        - socketprocess_networking+1proc
+        - webrender-sw+1proc
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            socketprocess_networking+1proc:
+                by-test-platform:
+                    .*asan.*: []
+                    .*ccov.*: []
+                    (linux.*64|macosx.*64|windows11-64.*)(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    default: []
+            webrender-sw+1proc:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            1proc:
+                by-test-platform:
+                    .*wayland.*: []
+                    default: built-projects
+    chunks:
+        by-test-platform:
+            .*tsan.*/opt: 6
+            default: 3
+    max-run-time: 3600
+    mozharness:
+        mochitest-flavor: chrome
+        chunked: true
+    instance-size:
+        by-test-platform:
+            linux.*64-tsan-qr/opt: xlarge  # runs out of memory otherwise using 8GB
+            default: default
+
+mochitest-devtools-chrome:
+    description: "Mochitest devtools-chrome run"
+    suite:
+        name: mochitest-devtools-chrome
+    schedules-component: mochitest-browser-chrome
+    treeherder-symbol: M(dt)
+    loopback-video: true
+    variants:
+        - a11y-checks
+        - socketprocess_networking
+        - webrender-sw
+        - devtools-no-eft+no-fission
+        - http3
+    run-on-projects:
+        by-variant:
+            a11y-checks:
+                by-test-platform:
+                    linux.*64(-shippable)?-qr/opt: ['trunk']
+                    default: []
+            devtools-no-eft+no-fission:
+                by-test-platform:
+                    linux.*64(-shippable)?-qr/opt: ['trunk']
+                    default: []
+            http3:
+                by-test-platform:
+                    linux1804-64-qr/debug: built-projects
+                    default: []
+            socketprocess_networking:
+                by-test-platform:
+                    .*asan.*: []
+                    .*ccov.*: []
+                    (linux.*64|macosx.*64|windows.*)(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    linux.*64-ccov-qr/opt: []
+                    default: built-projects
+    tier: default
+    max-run-time:
+        by-test-platform:
+            windows.*-ccov.*/.*: 10800
+            macosx.*64-ccov.*/.*: 9000
+            linux.*64-ccov.*/.*: 7200
+            linux.*64-tsan-qr/opt: 7200
+            default: 5400
+    chunks:
+        by-test-platform:
+            .*-ccov.*/.*: 12
+            linux.*64-qr/debug: 12
+            macosx.*64-qr/debug: 8
+            .*-asan(-qr)?/opt: 8
+            .*-tsan-qr/opt: 16
+            default: 5
+    mozharness:
+        mochitest-flavor: chrome
+        chunked: true
+    instance-size:
+        by-test-platform:
+            linux.*64-[at]san(-qr)?/opt: xlarge  # runs out of memory otherwise using 8GB
+            default: default
+    # Bug 1296086: high number of intermittents observed with software GL and large instances
+    allow-software-gl-layers: false
+    fetches:
+        toolchain:
+            by-test-platform:
+                linux.*:
+                    - linux64-node-12
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                macosx.*:
+                    - macosx64-node-12
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*-64.*:
+                    - win64-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                win.*32.*:
+                    - win32-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                android-em-7.*:
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - android-emulator-linux
+                    - linux64-node-12
+                    - linux64-minidump-stackwalk
+
+mochitest-plain-gpu:
+    description: "Mochitest plain GPU run"
+    suite:
+        name: mochitest-plain-gpu
+    treeherder-symbol: M(gpu)
+    schedules-component: mochitest-plain
+    loopback-video: true
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux.*asan.*: ['trunk']
+                    linux.*64(-shippable)?-qr/(opt|debug): ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux.*64-ccov-qr/opt: []
+                    linux1804-32.*: []
+                    .*-tsan-qr/opt: []
+                    .*wayland.*: []
+                    linux.*: ['trunk']  # linux opt/debug/asan
+                    android.*: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    .*wayland.*: []
+                    default: built-projects
+    virtualization: virtual-with-gpu
+    tier:
+        by-test-platform:
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            default: default
+    mozharness:
+        mochitest-flavor: plain
+        extra-options:
+            by-test-platform:
+                android.*:
+                    # note that Android runs fewer suites than other platforms
+                    - --test-suite=mochitest-plain-gpu
+                default:
+                    - --mochitest-suite=mochitest-plain-gpu
+    instance-size:
+        by-test-platform:
+            linux.*64-tsan-qr/opt: xlarge  # runs out of memory otherwise using 8GB
+            default: default
+
+mochitest-chrome-gpu:
+    description: "Mochitest chrome GPU run"
+    suite:
+        name: mochitest-chrome-gpu
+    treeherder-symbol: M(gpu-c)
+    loopback-video: true
+    virtualization: virtual-with-gpu
+    run-without-variant: false
+    variants:
+        - 1proc
+        - socketprocess_networking+1proc
+        - webrender-sw+1proc
+    run-on-projects:
+        by-variant:
+            socketprocess_networking+1proc: []
+            webrender-sw+1proc:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            1proc:
+                by-test-platform:
+                    android.*/.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    tier: default
+    mozharness:
+        mochitest-flavor: chrome
+        extra-options:
+            by-test-platform:
+                android.*:
+                    # note that Android runs fewer suites than other platforms
+                    - --test-suite=mochitest-chrome-gpu
+                default:
+                    - --mochitest-suite=mochitest-chrome-gpu
+    instance-size:
+        by-test-platform:
+            linux.*64-tsan-qr/opt: xlarge  # runs out of memory using 8GB of memory
+            default: default
+
+mochitest-media:
+    description: "Mochitest media run"
+    treeherder-symbol: M(mda)
+    schedules-component: mochitest-plain
+    max-run-time:
+        by-test-platform:
+            windows.*-ccov.*/.*: 7200
+            macosx.*64-ccov.*/.*: 7200
+            linux.*64-tsan-qr/opt: 7200
+            default: 5400
+    variants:
+        - no-fission
+        - socketprocess+no-fission
+        - socketprocess
+        - webgl-ipc
+        - webrender-sw+no-fission
+        - webrender-sw
+        - wmf-media-engine
+        - msix
+    run-on-projects:
+        by-variant:
+            webgl-ipc:
+                by-test-platform:
+                    android.*: []
+                    windows.*ccov.*: []
+                    linux.*64(-shippable|-asan)?-qr/opt: ['autoland', 'mozilla-central']  # linux.*-tsan disabled until Bug 1835935
+                    macosx.*64(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    windows1.*(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    windows.*-asan-qr/opt: ['autoland', 'mozilla-central']
+                    default: []
+            socketprocess+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: ['autoland', 'mozilla-central']
+                    android-hw-.*-aarch64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            socketprocess:
+                by-test-platform:
+                    android.*: []
+                    windows.*ccov.*: []
+                    linux.*64(-asan|-devedition|-shippable)?-qr/(opt|debug): built-projects
+                    linux.*64-tsan-qr/opt: []  # Linux TSAN disabled until Bug 1835935
+                    macosx.*-64(-devedition|-shippable)?-qr/(opt|debug): built-projects
+                    windows1.*(-devedition|-shippable)?-qr/(opt|debug): built-projects
+                    windows.*-asan-qr/opt: ['autoland', 'mozilla-central']
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: ['autoland', 'mozilla-central']
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    android.*: []
+                    linux1804-64-qr/debug: ['autoland', 'mozilla-central']
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-hw-.*/opt: []
+                    android-hw-.*-arm7.*/(?:debug)?: ['trunk', 'mozilla-beta', 'mozilla-release']
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    android.*: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            wmf-media-engine:
+                by-test-platform:
+                    windows1.*-64.*: ['autoland', 'mozilla-central']
+                    default: []
+            msix:
+                by-test-platform:
+                    windows11-64-2009-shippable-qr/opt: built-projects
+                    windows11-64-2009-qr/opt: ['autoland']
+                    windows11-64-2009-qr/debug: ['autoland']
+                    default: []
+            default:
+                by-test-platform:
+                    android-hw.*/opt: []
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    android.*: built-projects
+                    linux.*(asan|ccov)/opt: []
+                    .*(ccov/|asan/|-32).*: built-projects
+                    linux.*64-tsan.*: []  # linux.*-tsan disabled until Bug 1835935
+                    (android|linux|windows10-64-2009|windows11-64-2009|macos)(?!.*-qr).*: []
+                    default: built-projects
+    loopback-video: true
+    chunks:
+        by-variant:
+            wmf-media-engine: 1
+            default:
+                by-test-platform:
+                    (android|macos).*/opt: 1
+                    ^(?!.*asan).*windows1.*/opt: 1
+                    linux.*/debug: 3
+                    linux.*64-tsan-qr/opt: 5
+                    default: 2
+    mozharness:
+        mochitest-flavor: plain
+        chunked:
+            by-test-platform:
+                android.*: false
+                macosx.*64.*: false
+                windows1.*: false
+                default: true
+        extra-options:
+            by-test-platform:
+                android-em-7.*:
+                    - --setpref=webgl.out-of-process=false
+                    - --setpref=security.sandbox.content.headless=false
+                    - --setpref=gfx.canvas.accelerated=false
+                default:
+                    - --setpref=webgl.out-of-process=false
+                    - --setpref=security.sandbox.content.headless=false
+    tier:
+        by-test-platform:
+            .*ccov.*: 2
+            android-em.*: 1
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            android-hw.*: 1
+            default: default
+
+mochitest-valgrind:
+    description: "Mochitest plain Valgrind run"
+    suite:
+        name: mochitest-valgrind-plain
+    treeherder-symbol: M-V()
+    run-on-projects: []
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier: 3
+    loopback-video: true
+    chunks: 40
+    max-run-time: 14400
+    run-without-variant: false
+    variants: ["1proc"]
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        chunked: true
+
+mochitest-webgl1-core:
+    description: "Mochitest webgl1-core run"
+    treeherder-symbol: M(gl1c)
+    schedules-component: mochitest-plain
+    virtualization: virtual-with-gpu
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    loopback-video: true
+    max-run-time:
+        by-test-platform:
+            macosx.*64-ccov.*/.*: 7200
+            default: 1800
+    variants:
+        - no-fission
+        - webgl-ipc
+        - webrender-sw+no-fission
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webgl-ipc:
+                by-test-platform:
+                    .*-(ccov|tsan|wayland).*: []
+                    linux.*-64.*: ["trunk"]
+                    mac.*: ["trunk"]
+                    win.*: ["trunk"]
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    linux.*64-qr/debug: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-hw-.*(?<!-shippable)(-qr)?/opt: ['mozilla-central', 'mozilla-beta', 'mozilla-release']
+                    android-hw.*aarch.*-shippable-qr/opt: ['mozilla-central']
+                    android-hw.*aarch.*-qr/debug: ['mozilla-central']
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*-(tsan|wayland).*: []
+                    default: built-projects
+    # Bug 1296733: llvmpipe with mesa 9.2.1 lacks thread safety
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        extra-options:
+            - --setpref=webgl.out-of-process=false
+            - --setpref=security.sandbox.content.headless=false
+
+mochitest-webgl1-ext:
+    description: "Mochitest webgl1-ext run"
+    treeherder-symbol: M(gl1e)
+    schedules-component: mochitest-plain
+    virtualization: virtual-with-gpu
+    chunks:
+        by-test-platform:
+            android.*: 2
+            default: 1
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    loopback-video: true
+    max-run-time: 2700
+    variants:
+        - no-fission
+        - webgl-ipc
+        - webrender-sw+no-fission
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webgl-ipc:
+                by-test-platform:
+                    .*-(ccov|tsan|wayland).*/.*: []
+                    linux.*-64.*: ["trunk"]
+                    mac.*: ["trunk"]
+                    win.*: ["trunk"]
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    linux.*64-qr/debug: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-hw-.*(?<!-shippable)(-qr)?/opt: ['mozilla-central', 'mozilla-beta', 'mozilla-release']
+                    android-hw.*aarch.*-shippable-qr/opt: ['mozilla-central']
+                    android-hw.*aarch.*-qr/debug: ['mozilla-central']
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*-(tsan|wayland).*: []
+                    default: built-projects
+    # Bug 1296733: llvmpipe with mesa 9.2.1 lacks thread safety
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        chunked: true
+        extra-options:
+            - --setpref=webgl.out-of-process=false
+            - --setpref=security.sandbox.content.headless=false
+
+mochitest-webgl2-core:
+    description: "Mochitest webgl2-core run"
+    treeherder-symbol: M(gl2c)
+    schedules-component: mochitest-plain
+    virtualization: virtual-with-gpu
+    chunks:
+        by-test-platform:
+            android.*: 2
+            default: 1
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    loopback-video: true
+    max-run-time: 1800
+    variants:
+        - no-fission
+        - webgl-ipc
+        - webrender-sw+no-fission
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webgl-ipc:
+                by-test-platform:
+                    .*-(ccov|tsan|wayland).*/.*: []
+                    android.*: []
+                    linux.*-64.*: ["trunk"]
+                    mac.*: ["trunk"]
+                    win.*: ["trunk"]
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    linux.*64-qr/debug: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-hw-.*(?<!-shippable)(-qr)?/opt: ['mozilla-central', 'mozilla-beta', 'mozilla-release']
+                    android-hw.*aarch.*-shippable-qr/opt: ['mozilla-central']
+                    android-hw.*aarch.*-qr/debug: ['mozilla-central']
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*-(tsan|wayland).*: []
+                    default: built-projects
+    # Bug 1296733: llvmpipe with mesa 9.2.1 lacks thread safety
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        chunked: true
+
+mochitest-webgl2-ext:
+    description: "Mochitest webgl2-ext run"
+    treeherder-symbol: M(gl2e)
+    schedules-component: mochitest-plain
+    virtualization: virtual-with-gpu
+    variants:
+        - no-fission
+        - webgl-ipc
+        - webrender-sw+no-fission
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webgl-ipc:
+                by-test-platform:
+                    .*(ccov|tsan|wayland).*/.*: []
+                    linux.*-64.*: ["trunk"]
+                    mac.*: ["trunk"]
+                    win.*: ["trunk"]
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    linux.*64-qr/debug: ["trunk"]
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*-(tsan|wayland).*: []
+                    default: built-projects
+    chunks: 4
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    loopback-video: true
+    max-run-time: 2700
+    # Bug 1296733: llvmpipe with mesa 9.2.1 lacks thread safety
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        chunked: true
+        extra-options:
+            - --setpref=webgl.out-of-process=false
+            - --setpref=security.sandbox.content.headless=false
+
+mochitest-webgl2-deqp:
+    description: "Mochitest webgl2-deqp run"
+    treeherder-symbol: M(gl2d)
+    schedules-component: mochitest-plain
+    virtualization: virtual-with-gpu
+    variants:
+        - webgl-ipc
+        - webrender-sw
+    run-on-projects: []  # Don't run this for now.
+    chunks: 4
+    loopback-video: true
+    max-run-time: 1800
+    # Bug 1296733: llvmpipe with mesa 9.2.1 lacks thread safety
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+        chunked: true
+        extra-options:
+            - --setpref=webgl.out-of-process=false
+            - --setpref=security.sandbox.content.headless=false
+
+mochitest-webgpu:
+    description: "Mochitest webgpu run"
+    treeherder-symbol: M(webgpu)
+    schedules-component: mochitest-plain
+    virtualization: virtual-with-gpu
+    loopback-video: true
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: ["trunk"]
+                    default: []
+            no-fission:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*mingw.*: ["mozilla-central"]
+                    .*shippable.*: ["mozilla-central"]
+                    .*ccov.*: ['mozilla-central']
+                    .*tsan.*: ['trunk']
+                    linux1804-64-qr/debug: ['trunk']
+                    .*(!-shippable)-qr.*: ["trunk"]
+                    default: []
+    max-run-time:
+        by-test-platform:
+            macosx.*64-ccov.*/.*: 7200
+            default: 1800
+    # Bug 1296733: llvmpipe with mesa 9.2.1 lacks thread safety
+    allow-software-gl-layers: false
+    mozharness:
+        mochitest-flavor: plain
+
+mochitest-remote:
+    description: "Mochitest for the remote agent (/remote folder)"
+    suite:
+        name: mochitest-remote
+    treeherder-symbol: M(remote)
+    loopback-video: true
+    variants:
+        - no-fission
+        - socketprocess_networking
+        - webrender-sw+no-fission
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            socketprocess_networking:
+                by-test-platform:
+                    .*asan.*: []
+                    .*ccov.*: []
+                    (linux.*64|macosx.*64|windows1.*-64.*)(-shippable)?-qr/(opt|debug): ['autoland', 'mozilla-central']
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    linux.*64-qr/debug: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64-qr/debug: ['all']
+                    default: []
+            no-fission:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    tier: default
+    max-run-time: 5400
+    mozharness:
+        mochitest-flavor: browser
+        extra-options:
+            - --setpref=remote.log.level=Trace
+    virtualization: virtual
diff --git a/taskcluster/ci/test/reftest.yml b/taskcluster/ci/test/reftest.yml
new file mode 100644
index 0000000000..a5172dfe54
--- /dev/null
+++ b/taskcluster/ci/test/reftest.yml
@@ -0,0 +1,260 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite:
+        category: reftest
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-test_runner.apk
+            android-hw-.*: geckoview-test_runner.apk
+            default: null
+    tier: default
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                android-hw.*: android_hardware_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                android-hw.*:
+                    - android/android_common.py
+                    - android/android_hw.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+
+crashtest:
+    description: "Crashtest run"
+    schedules-component: crashtest
+    treeherder-symbol: R(C)
+    chunks:
+        by-test-platform:
+            android-em-7.*: 1
+            linux.*64-tsan-qr/opt: 32
+            default: 1
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+        - webrender-sw
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    macosx101.*64-qr/debug: built-projects
+                    linux.*-64-qr/debug: built-projects
+                    linux.*-64(-tsan|-asan)-qr/opt: built-projects
+                    windows.*-asan-qr/opt: built-projects
+                    windows1.*-64.*-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    max-run-time: 3600
+    tier:
+        by-test-platform:
+            android-hw-.*-qr/.*: 2
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            default: default
+
+crashtest-qr:
+    description: "Crashtest Webrender run"
+    schedules-component: crashtest
+    treeherder-symbol: R(C)
+    chunks: 1
+    variants:
+        - no-fission
+    run-on-projects:
+        by-variant:
+            no-fission: built-projects
+            default: []
+    max-run-time: 1200
+    tier: 2
+    virtualization: virtual
+
+jsreftest:
+    description: "JS Reftest run"
+    schedules-component: jsreftest
+    treeherder-symbol: R(J)
+    instance-size: default
+    chunks:
+        by-test-platform:
+            android-hw.*\/debug: 12
+            android-hw.*/(opt|pgo)?: 6
+            windows.*-asan-qr/opt: 3
+            windows.*-ccov-qr/opt: 5
+            windows.*\/opt: 2
+            linux.*64-ccov.*/.*: 5
+            linux1804-64-qr/opt: 4
+            linux1804-64-qr/debug: 5
+            linux1804-64/debug: 5
+            .*-tsan-qr/opt: 8
+            macosx.*-64-ccov.*/.*: 5
+            macosx.*-64(-shippable)?/opt: 2
+            default: 3
+    max-run-time:
+        by-test-platform:
+            .*ccov.*: 7200
+            default: 3600
+    variants:
+        - no-fission
+    run-on-projects:
+        by-variant:
+            no-fission:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android-hw-.*-aarch64(?:-shippable)?-qr/.*: ['mozilla-central', 'release']
+                    android-hw-.*-arm7(?:-shippable)?-qr/.*: ['mozilla-central', 'release']
+                    android.*: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    android.*/.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    virtualization: virtual
+
+reftest:
+    description: "Reftest run"
+    treeherder-symbol: R(R)
+    virtualization: virtual-with-gpu
+    chunks:
+        by-test-platform:
+            android-em-7.*: 6
+            linux1804-64(-shippable|-devedition|-qr)?/opt: 5
+            linux.*64-tsan-qr/opt: 32
+            macosx101.*-64-shippable(-qr)?/opt: 3
+            macosx101.*-64/debug: 4
+            macosx101.*-64(-ccov.*|-qr)/debug: 6
+            windows.*64.*/debug: 4
+            windows.*32.*/debug: 6
+            windows.*-ccov-qr/opt: 9
+            windows10.*asan.*: 3
+            windows10.*/opt: 2
+            windows11.*/opt: 3
+            default: 8
+    variants:
+        - no-fission
+        - webrender-dcomp-disabled
+        - webrender-dcomp-present
+        - webrender-dcomp-overlays
+        - webrender-dcomp-compositing  # Should match default
+        - webrender-sw+no-fission
+        - webrender-sw
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux1804-64-qr/debug: built-projects
+                    linux1804-64(-asan|-tsan)-qr/opt: built-projects
+                    macosx101.*64-qr/debug: built-projects
+                    windows.*-asan-qr/opt: built-projects
+                    windows7-32(?:-shippable)?-qr/opt: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*/.*: []
+                    .*wayland.*: []
+                    linux.*asan/opt: []
+                    default: built-projects
+    max-run-time:
+        by-test-platform:
+            windows.*-32-mingwclang-qr/debug: 5400
+            windows.*-ccov.*/.*: 5400
+            windows.*-asan-qr/opt: 5400
+            macosx.*64-ccov.*/.*: 5400
+            default: 3600
+    mozharness:
+        chunked:
+            by-test-platform:
+                android-em.*: false
+                macosx.*64/opt: false
+                windows.*/opt: false
+                default: true
+    tier:
+        by-test-platform:
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            default: default
+
+reftest-qr:
+    description: "Reftest webrender run"
+    treeherder-symbol: R(R)
+    chunks: 2
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+    run-without-variant: false
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-hw-p5-13-0-android-aarch64-qr/debug: built-projects
+                    default: []
+            no-fission: built-projects
+    max-run-time: 2400
+    mozharness:
+        chunked: true
+    tier: 2
+    virtualization: virtual
+
+reftest-snapshot:
+    description: "Reftest snapshot"
+    treeherder-symbol: R(Rs)
+    virtualization: virtual
+    run-on-projects:
+        by-test-platform:
+            linux1804-64-qr/debug: ['trunk']
+            default: []
+    tier: default
+    chunks: 8
+    mozharness:
+        chunked: true
diff --git a/taskcluster/ci/test/talos.yml b/taskcluster/ci/test/talos.yml
new file mode 100644
index 0000000000..9269e8bc42
--- /dev/null
+++ b/taskcluster/ci/test/talos.yml
@@ -0,0 +1,780 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    max-run-time: 3600
+    suite: talos
+    tier:
+        by-test-platform:
+            macosx1100.*: 2
+            default: default
+    virtualization: hardware
+    mozharness:
+        script: talos_script.py
+        config:
+            by-test-platform:
+                macosx.*:
+                    - talos/mac_config.py
+                windows.*:
+                    - talos/windows_config.py
+                default:
+                    - talos/linux_config.py
+    test-manifest-loader: null  # don't load tests in the taskgraph
+
+talos-bcv:
+    description: Talos basic compositor video
+    try-name: bcv
+    treeherder-symbol: T(bcv)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|macosx1015|windows10)-64-shippable-qr/opt: [mozilla-beta, trunk]
+                    (windows10-64|macosx1015-64).*-qr.*: [trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macos)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=bcv
+
+talos-bcv-profiling:
+    description: Talos basic compositor video with gecko profiling
+    try-name: bcv-prof
+    treeherder-symbol: T-Prof(bcv)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=bcv
+            - --gecko-profile
+
+talos-chrome:
+    description: Talos chrome
+    try-name: chromez
+    treeherder-symbol: T(c)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+            default: [mozilla-beta, trunk]
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=chromez
+
+talos-chrome-profiling:
+    description: Talos chrome with gecko profiling
+    try-name: chromez-prof
+    treeherder-symbol: T-Prof(c)
+    tier: 2
+    max-run-time: 1200
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=chromez
+            - --gecko-profile
+
+talos-damp-inspector:
+    description: Talos devtools inspector (damp-inspector)
+    try-name: damp-inspector
+    treeherder-symbol: T(damp-inspector)
+    max-run-time: 5400
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx1015)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32-shippable.*/.*: []
+                    (linux|windows|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macos)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    mozharness:
+        extra-options:
+            - --suite=damp-inspector
+
+talos-damp-webconsole:
+    description: Talos devtools webconsole (damp-webconsole)
+    try-name: damp-webconsole
+    treeherder-symbol: T(damp-webconsole)
+    max-run-time: 5400
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx1015)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32-shippable.*/.*: []
+                    (linux|windows|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macos)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    mozharness:
+        extra-options:
+            - --suite=damp-webconsole
+
+talos-damp-other:
+    description: Talos devtools other (damp-other)
+    try-name: damp-other
+    treeherder-symbol: T(damp-other)
+    max-run-time: 5400
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx1015)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32-shippable.*/.*: []
+                    (linux|windows|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macos)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    mozharness:
+        extra-options:
+            - --suite=damp-other
+
+talos-damp-inspector-profiling:
+    description: Talos devtools inspector (damp-inspector) with gecko profiling
+    try-name: damp-inspector-prof
+    treeherder-symbol: T-Prof(damp-inspector)
+    tier: 2
+    max-run-time: 5400
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=damp-inspector
+            - --gecko-profile
+
+talos-damp-webconsole-profiling:
+    description: Talos devtools webconsole (damp-webconsole) with gecko profiling
+    try-name: damp-webconsole-prof
+    treeherder-symbol: T-Prof(damp-webconsole)
+    tier: 2
+    max-run-time: 5400
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=damp-webconsole
+            - --gecko-profile
+
+talos-damp-other-profiling:
+    description: Talos devtools other (damp-other) with gecko profiling
+    try-name: damp-other-prof
+    treeherder-symbol: T-Prof(damp-other)
+    tier: 2
+    max-run-time: 5400
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=damp-other
+            - --gecko-profile
+
+talos-dromaeojs:
+    description: Talos dromaeojs
+    try-name: dromaeojs
+    treeherder-symbol: T(d)
+    max-run-time: 2100
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+            default: [mozilla-beta, trunk]
+    mozharness:
+        extra-options:
+            - --suite=dromaeojs
+
+talos-dromaeojs-profiling:
+    description: Talos dromaeojs with gecko profiling
+    try-name: dromaeojs-prof
+    treeherder-symbol: T-Prof(d)
+    tier: 2
+    max-run-time: 2100
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=dromaeojs
+            - --gecko-profile
+
+talos-g1:
+    description: Talos g1
+    try-name: g1
+    treeherder-symbol: T(g1)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 3600
+            default: 7200
+    mozharness:
+        extra-options:
+            - --suite=g1
+
+talos-g1-profiling:
+    description: Talos g1 with gecko profiling
+    try-name: g1-prof
+    treeherder-symbol: T-Prof(g1)
+    tier: 2
+    run-on-projects: []
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 3600
+            default: 7200
+    mozharness:
+        extra-options:
+            - --suite=g1
+            - --gecko-profile
+
+talos-g3:
+    description: Talos g3
+    try-name: g3
+    treeherder-symbol: T(g3)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 900
+    mozharness:
+        extra-options:
+            - --suite=g3
+
+talos-g3-profiling:
+    description: Talos g3 with gecko profiling
+    try-name: g3-prof
+    treeherder-symbol: T-Prof(g3)
+    tier: 2
+    max-run-time: 900
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=g3
+            - --gecko-profile
+
+talos-g4:
+    description: Talos g4
+    try-name: g4
+    treeherder-symbol: T(g4)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx1015)-64-shippable-qr/opt: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macos)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 1500
+            default: 1800
+    mozharness:
+        extra-options:
+            - --suite=g4
+
+talos-g4-profiling:
+    description: Talos g4 with gecko profiling
+    try-name: g4-prof
+    treeherder-symbol: T-Prof(g4)
+    tier: 2
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 1500
+            default: 1800
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=g4
+            - --gecko-profile
+
+talos-g5:
+    description: Talos g5
+    try-name: g5
+    treeherder-symbol: T(g5)
+    mozharness:
+        extra-options:
+            - --suite=g5
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 1200
+            macosx.*: 2400
+            default: 1800
+
+talos-g5-profiling:
+    description: Talos g5 with gecko profiling
+    try-name: g5-prof
+    treeherder-symbol: T-Prof(g5)
+    tier: 2
+    run-on-projects: []
+    mozharness:
+        extra-options:
+            - --suite=g5
+            - --gecko-profile
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 1200
+            default: 1800
+
+talos-h1:
+    description: Talos h1
+    try-name: h1
+    treeherder-symbol: T(h1)
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+            default: [mozilla-beta, trunk]
+    mozharness:
+        extra-options:
+            - --suite=h1
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 900
+            default: 1800
+
+talos-h2:
+    description: Talos h2
+    try-name: h2
+    treeherder-symbol: T(h2)
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+            default: [mozilla-beta, trunk]
+    max-run-time:
+        by-test-platform:
+            linux1804-64.*: 900
+            default: 7200
+    mozharness:
+        extra-options:
+            - --suite=h2
+
+talos-motionmark:
+    description: Talos motionmark
+    try-name: motionmark
+    treeherder-symbol: T(mm)
+    run-on-projects:
+        by-test-platform:
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macos)(?!.*-qr).*: []
+            default: [mozilla-central]
+    max-run-time: 3600
+    tier: 2
+    mozharness:
+        extra-options:
+            - --suite=motionmark
+
+talos-motionmark-profiling:
+    description: Talos motionmark with gecko profiling
+    try-name: motionmark-prof
+    treeherder-symbol: T-Prof(mm)
+    run-on-projects: []
+    max-run-time: 3600
+    tier: 2
+    mozharness:
+        extra-options:
+            - --suite=motionmark
+            - --gecko-profile
+
+talos-other:
+    description: Talos other
+    try-name: other
+    treeherder-symbol: T(o)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=other
+
+talos-other-profiling:
+    description: Talos other with gecko profiling
+    try-name: other-prof
+    treeherder-symbol: T-Prof(o)
+    run-on-projects: []
+    tier: 2
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=other
+            - --gecko-profile
+
+talos-sessionrestore-many-windows:
+    description: Talos sessionrestore-many-windows
+    try-name: sessionrestore-many-windows
+    treeherder-symbol: T(smw)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-central, autoland]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-central, autoland]
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=sessionrestore-many-windows
+
+talos-sessionrestore-many-windows-profiling:
+    description: Talos sessionrestore-many-windows with gecko profiling
+    try-name: sessionrestore-many-windows-prof
+    treeherder-symbol: T-Prof(smw)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=sessionrestore-many-windows
+            - --gecko-profile
+
+talos-perf-reftest:
+    description: Talos perf-reftest
+    try-name: perf-reftest
+    treeherder-symbol: T(p)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 1200
+    mozharness:
+        extra-options:
+            - --suite=perf-reftest
+
+talos-perf-reftest-profiling:
+    description: Talos perf-reftest with gecko profiling
+    try-name: perf-reftest-prof
+    treeherder-symbol: T-Prof(p)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1200
+    mozharness:
+        extra-options:
+            - --suite=perf-reftest
+            - --gecko-profile
+
+talos-perf-reftest-singletons:
+    description: Talos perf-reftest singletons
+    try-name: perf-reftest-singletons
+    treeherder-symbol: T(ps)
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+            default: [mozilla-beta, trunk]
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=perf-reftest-singletons
+
+talos-perf-reftest-singletons-profiling:
+    description: Talos perf-reftest singletons with gecko profiling
+    try-name: perf-reftest-singletons-prof
+    treeherder-symbol: T-Prof(ps)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=perf-reftest-singletons
+            - --gecko-profile
+
+talos-svgr:
+    description: Talos svgr
+    try-name: svgr
+    treeherder-symbol: T(s)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=svgr
+
+talos-svgr-profiling:
+    description: Talos svgr with gecko profiling
+    try-name: svgr-prof
+    treeherder-symbol: T-Prof(s)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=svgr
+            - --gecko-profile
+
+talos-tp5o:
+    description: Talos tp5o
+    try-name: tp5o
+    treeherder-symbol: T(tp)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=tp5o
+
+talos-tp5o-profiling:
+    description: Talos tp5o with gecko profiling
+    try-name: tp5o-prof
+    treeherder-symbol: T-Prof(tp)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=tp5o
+            - --gecko-profile
+
+talos-tabswitch:
+    description: Talos page scroll (tabswitch)
+    try-name: tabswitch
+    treeherder-symbol: T(tabswitch)
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx.*)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=tabswitch
+
+talos-tabswitch-profiling:
+    description: Talos page scroll (tabswitch) with gecko profiling
+    try-name: tabswitch-prof
+    treeherder-symbol: T-Prof(tabswitch)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1200
+    mozharness:
+        extra-options:
+            - --suite=tabswitch
+            - --gecko-profile
+
+talos-webgl:
+    description: Talos WebGL
+    try-name: webgl
+    treeherder-symbol: T(webgl)
+    variants:
+        - webrender-sw
+        - webgl-ipc
+    run-on-projects:
+        by-variant:
+            webgl-ipc:
+                by-test-platform:
+                    (linux1804|windows10|macosx1015)-64.*: [trunk]
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    (linux1804|windows10|macosx1015)-64-shippable-qr.*: [mozilla-beta, trunk]
+                    default: []
+            default:
+                by-test-platform:
+                    windows.*-32.*: []
+                    (linux|windows10-64|macos)(?!.*shippable).*: []
+                    (linux|windows10-64|macos)(?!.*-qr).*: []
+                    default: [mozilla-beta, trunk]
+    max-run-time: 2100
+    mozharness:
+        extra-options:
+            by-test-platform:
+                windows10-64-ref-hw.*:
+                    - --suite=webgl
+                    - --skip-preflight
+                default:
+                    - --suite=webgl
+
+talos-webgl-profiling:
+    description: Talos WebGL with gecko profiling
+    try-name: webgl
+    treeherder-symbol: T-Prof(webgl)
+    tier: 2
+    variants:
+        - webgl-ipc
+    run-on-projects: []
+    max-run-time: 1800
+    mozharness:
+        extra-options:
+            - --suite=webgl
+            - --gecko-profile
+
+talos-xperf:
+    description: Talos xperf
+    try-name: xperf
+    treeherder-symbol: T(x)
+    virtualization: virtual
+    os-groups: [Administrators]
+    run-as-administrator:
+        by-test-platform:
+            windows.*32.*: false
+            windows10.*64.*: true
+            windows11.*64.*: true
+    variants:
+        - webrender-sw
+    run-on-projects:
+        by-test-platform:
+            windows.*-32-shippable(?:-qr)?/.*: []
+            windows10.*-shippable-qr/.*: [mozilla-beta, trunk]
+            windows11.*-shippable-qr/.*: [mozilla-beta, trunk]
+            default: []
+    mozharness:
+        extra-options:
+            - --suite=xperf
+        config:
+            by-test-platform:
+                windows.*:
+                    - talos/windows_vm_config.py
+
+talos-realworld-webextensions:
+    description: Talos tests with realworld WebExtensions
+    try-name: realworld-webextensions
+    treeherder-symbol: T(realwebext)
+    run-on-projects:
+        by-test-platform:
+            windows.*-32.*: []
+            (linux|windows10-64|macos)(?!.*shippable).*: []
+            (linux|windows10-64|macosx1015)(?!.*-qr).*: []
+            default: [mozilla-beta, trunk]
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=realworld-webextensions
+
+talos-realworld-webextensions-profiling:
+    description: Talos tests with realworld WebExtensions with gecko profiling
+    try-name: realworld-webextensions-prof
+    treeherder-symbol: T-Prof(realwebext)
+    tier: 2
+    run-on-projects: []
+    max-run-time: 1500
+    mozharness:
+        extra-options:
+            - --suite=realworld-webextensions
+            - --gecko-profile
diff --git a/taskcluster/ci/test/test-platforms.yml b/taskcluster/ci/test/test-platforms.yml
new file mode 100644
index 0000000000..f4de48c5f8
--- /dev/null
+++ b/taskcluster/ci/test/test-platforms.yml
@@ -0,0 +1,464 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+# This file maps build platforms to test platforms.  In some cases, a
+# single build may be tested on multiple test platforms, but a single test
+# platform can only link to one build platform.  Both build and test platforms
+# are represented as <platform>/<type>, where <type> is what Treeherder calls a
+# collection.
+#
+# Each test platform further specifies the set of tests that will be scheduled
+# for the platform, referring to tests defined in test-sets.yml.
+#
+# Note that set does not depend on the tree; tree-dependent job selection
+# should be performed in the target task selection phase of task-graph
+# generation.
+
+
+##
+# Linux platforms (matching /linux.*/)
+# Linux1804-64 uses Ubuntu 18.04 and is run on docker
+
+linux1804-32-qr/debug:
+    build-platform: linux/debug
+    test-sets:
+        - linux32-gtest
+
+linux1804-32-qr/opt:
+    build-platform: linux/opt
+    test-sets:
+        - linux32-tests
+        - linux32-gtest
+
+linux1804-32-shippable-qr/opt:
+    build-platform: linux-shippable/opt
+    test-sets:
+        - linux32-tests
+        - linux32-gtest
+
+linux1804-64-qr/opt:
+    build-platform: linux64/opt
+    test-sets:
+        - awsy
+        - desktop-screenshot-capture
+        - linux1804-tests
+        - mochitest-webgpu
+        - web-platform-tests
+        - web-platform-tests-backlog
+        - talos
+        - browsertime
+
+linux1804-64-shippable-qr/opt:
+    build-platform: linux64-shippable/opt
+    test-sets:
+        - awsy
+        - desktop-screenshot-capture
+        - linux1804-tests
+        - mochitest-webgpu
+        - web-platform-tests
+        - web-platform-tests-backlog
+        - talos
+        - talos-profiling
+        - browsertime
+        - browsertime-profiling
+
+linux1804-64-nightlyasrelease-qr/opt:
+    build-platform: linux64-nightlyasrelease/opt
+    test-sets:
+        - browsertime
+
+linux1804-64-qr/debug:
+    build-platform: linux64/debug
+    test-sets:
+        - linux1804-tests
+        - mochitest-webgpu
+        - web-platform-tests
+
+linux1804-64-asan-qr/opt:
+    build-platform: linux64-asan/opt
+    test-sets:
+        - linux1804-tests
+        - mochitest-webgpu
+        - web-platform-tests
+
+linux1804-64-tsan-qr/opt:
+    build-platform: linux64-tsan/opt
+    test-sets:
+        - linux1804-tests
+        - mochitest-webgpu
+        - web-platform-tests
+
+linux1804-64-ccov-qr/opt:
+    build-platform: linux64-ccov/opt
+    test-sets:
+        - ccov-code-coverage-tests
+        - linux1804-tests
+        - linux1804-ccov-tests
+        - mochitest-webgpu
+        - web-platform-tests
+
+linux1804-64-devedition-qr/opt:
+    build-platform: linux64-devedition/opt
+    test-sets:
+        - desktop-screenshot-capture
+        - linux1804-tests
+        - web-platform-tests
+
+linux1804-64-clang-trunk-qr/opt:
+    build-platform: linux64-plain-clang-trunk/opt
+    test-sets:
+        - awsy
+        - browsertime-clang
+
+linux2204-64-wayland/opt:
+    build-platform: linux64/opt
+    test-sets:
+        - linux2204-wayland-tests
+        - web-platform-tests
+
+linux2204-64-wayland-shippable/opt:
+    build-platform: linux64-shippable/opt
+    test-sets:
+        - linux2204-wayland-tests
+        - web-platform-tests
+
+##
+# Windows platforms (matching /windows.*/)
+
+# win32
+windows7-32-qr/opt:
+    build-platform: win32/opt
+    build-signing-label: build-signing-win32/opt
+    test-sets:
+        - windows-7-tests
+
+windows7-32-shippable-qr/opt:
+    build-platform: win32-shippable/opt
+    build-signing-label: build-signing-win32-shippable/opt
+    test-sets:
+        - windows-7-tests
+
+windows10-32-shippable-qr/opt:
+    build-platform: win32-shippable/opt
+    build-signing-label: build-signing-win32-shippable/opt
+    test-sets:
+        - browsertime
+        - windows-talos
+
+windows10-32-qr/opt:
+    build-platform: win32/opt
+    test-sets:
+        - browsertime
+        - windows-talos
+
+
+# win11-32
+windows11-32-2009-shippable-qr/opt:
+    build-platform: win32-shippable/opt
+    test-sets:
+        - awsy
+        - desktop-screenshot-capture
+        - web-platform-tests
+        - windows32-2009-tests
+
+
+windows11-32-2009-qr/opt:
+    build-platform: win32/opt
+    test-sets:
+        - awsy
+        - desktop-screenshot-capture
+        - web-platform-tests
+        - windows32-2009-tests
+
+windows11-32-2009-qr/debug:
+    build-platform: win32/debug
+    build-signing-label: build-signing-win32/debug
+    test-sets:
+        - web-platform-tests
+        - windows-7-tests
+        - windows32-2009-tests
+
+windows11-32-2009-mingwclang-qr/debug:
+    build-platform: win32-mingwclang/debug
+    test-sets:
+        - mingwclang-win32-tests-debug
+
+windows11-32-2009-mingwclang-qr/opt:
+    build-platform: win32-mingwclang/opt
+    test-sets:
+        - mingwclang-tests-opt
+
+# win64
+windows10-64-qr/opt:
+    build-platform: win64/opt
+    test-sets:
+        - windows-talos
+        - browsertime
+
+windows10-64-ref-hw-2017-qr/opt:
+    build-platform: win64-shippable/opt
+    test-sets:
+        - talos-ref-hw
+
+windows10-64-shippable-qr/opt:
+    build-platform: win64-shippable/opt
+    test-sets:
+        - windows-talos
+        - browsertime
+
+windows10-64-nightlyasrelease-qr/opt:
+    build-platform: win64-nightlyasrelease/opt
+    test-sets:
+        - browsertime
+
+# win10-64 2004
+windows10-64-2009-qr/debug:
+    build-platform: win64/debug
+    build-signing-label:
+        by-variant:
+            msix: repackage-signing-msix-win64/debug
+            default: build-signing-win64/debug
+    test-sets:
+        - windows10-2009-tests
+
+windows10-64-2009-qr/opt:
+    build-platform: win64/opt
+    build-signing-label:
+        by-variant:
+            msix: repackage-signing-msix-win64/opt
+            default: build-signing-win64/opt
+    test-sets:
+        - windows10-2009-tests
+
+windows10-64-2009-shippable-qr/opt:
+    build-platform: win64-shippable/opt
+    build-signing-label:
+        by-variant:
+            msix: repackage-signing-shippable-l10n-msix-win64-shippable/opt
+            default: build-signing-win64-shippable/opt
+    test-sets:
+        - windows10-2009-tests
+
+# win11-64 2009
+windows11-64-2009-ccov-qr/opt:
+    build-platform: win64-ccov/opt
+    build-signing-label: build-signing-win64-ccov/opt
+    test-sets:
+        - desktop-screenshot-capture
+        - ccov-code-coverage-tests
+        - windows11-64-2009-ccov-tests
+        - windows11-2009-tests
+
+windows11-64-2009-qr/debug:
+    build-platform: win64/debug
+    build-signing-label:
+        by-variant:
+            msix: repackage-signing-msix-win64/debug
+            default: build-signing-win64/debug
+    test-sets:
+        - web-platform-tests
+        - windows11-2009-tests
+
+windows11-64-2009-qr/opt:
+    build-platform: win64/opt
+    build-signing-label:
+        by-variant:
+            msix: repackage-signing-msix-win64/opt
+            default: build-signing-win64/opt
+    test-sets:
+        - awsy
+        - desktop-screenshot-capture
+        - web-platform-tests
+        - web-platform-tests-backlog
+        - windows11-2009-tests
+        - talos-xperf
+
+windows11-64-2009-shippable-qr/opt:
+    build-platform: win64-shippable/opt
+    build-signing-label:
+        by-variant:
+            msix: repackage-signing-shippable-l10n-msix-win64-shippable/opt
+            default: build-signing-win64-shippable/opt
+    test-sets:
+        - awsy
+        - desktop-screenshot-capture
+        - web-platform-tests
+        - web-platform-tests-backlog
+        - windows11-2009-tests
+        - talos-xperf
+
+windows11-64-2009-devedition-qr/opt:
+    build-platform: win64-devedition/opt
+    build-signing-label: build-signing-win64-devedition/opt
+    test-sets:
+        - desktop-screenshot-capture
+        - web-platform-tests
+        - windows11-2009-tests
+
+windows11-64-2009-asan-qr/opt:
+    build-platform: win64-asan/opt
+    test-sets:
+        - windows11-2009-tests
+
+windows11-64-2009-mingwclang-qr/debug:
+    build-platform: win64-mingwclang/debug
+    test-sets:
+        - mingwclang-tests-debug
+
+windows11-64-2009-mingwclang-qr/opt:
+    build-platform: win64-mingwclang/opt
+    test-sets:
+        - mingwclang-tests-opt
+
+
+##
+# MacOS X platforms (matching /macosx.*/)
+
+macosx1100-64-qr/debug:
+    build-platform: macosx64/debug
+    build-signing-label: repackage-macosx64/debug
+    test-sets:
+        - macosx1100-64-jittests
+
+macosx1100-64-shippable-qr/opt:
+    build-platform: macosx64-shippable/opt
+    build-signing-label: repackage-macosx64-shippable/opt
+    test-sets:
+        - macosx1100-64-jittests
+        - macosx1100-64-qr-tests
+        # - macosx64-talos
+        # - browsertime-high-priority
+
+macosx1015-64-shippable-qr/opt:
+    build-platform: macosx64-shippable/opt
+    test-sets:
+        - awsy
+        - browsertime
+        - browsertime-profiling
+        - desktop-screenshot-capture
+        - macosx1015-64-qr-tests
+        - macosx64-talos
+        - talos-profiling
+        - web-platform-tests
+        - web-platform-tests-backlog
+
+macosx1015-64-nightlyasrelease-qr/opt:
+    build-platform: macosx64-nightlyasrelease/opt
+    test-sets:
+        - browsertime
+
+macosx1015-64-devedition-qr/opt:
+    build-platform: macosx64-devedition/opt
+    test-sets:
+        - macosx1015-64-qr-tests
+        - web-platform-tests
+
+macosx1015-64-qr/opt:
+    build-platform: macosx64/opt
+    test-sets:
+        - desktop-screenshot-capture
+        - macosx1015-64-qr-tests
+        - web-platform-tests
+        - web-platform-tests-backlog
+
+macosx1015-64-qr/debug:
+    build-platform: macosx64/debug
+    test-sets:
+        - macosx1015-64-qr-tests
+        - web-platform-tests
+
+macosx1015-64-ccov-qr/opt:
+    build-platform: macosx64-ccov/opt
+    test-sets:
+        - macosx1015-64-qr-tests
+
+##
+# Android platforms (matching /android-em.*/)
+#
+# android-em test platforms execute on android emulators.
+
+android-em-7.0-x86_64-qr/opt:
+    build-platform: android-x86_64/opt
+    test-sets:
+        - android-x86_64-tests
+        - web-platform-tests-backlog
+
+android-em-7.0-x86_64-lite-qr/opt:
+    build-platform: android-x86_64-lite/opt
+    test-sets:
+        - android-x86_64-tests
+        - web-platform-tests-backlog
+
+android-em-7.0-x86_64-shippable-qr/opt:
+    build-platform: android-x86_64-shippable/opt
+    test-sets:
+        - android-x86_64-tests
+        - web-platform-tests-backlog
+
+android-em-7.0-x86_64-shippable-lite-qr/opt:
+    build-platform: android-x86_64-shippable-lite/opt
+    test-sets:
+        - android-x86_64-tests
+        - web-platform-tests-backlog
+
+android-em-7.0-x86_64-qr/debug:
+    build-platform: android-x86_64/debug
+    test-sets:
+        - android-x86_64-tests
+
+android-em-7.0-x86_64-qr/debug-isolated-process:
+    build-platform: android-x86_64/debug-isolated-process
+    test-sets:
+        - android-x86_64-tests
+
+# android-hw test platforms execute on real devices attached to Autophone hosts.
+
+# android-hw-a51-11-0 Samsung Galaxy A51 Android 11.0
+
+android-hw-a51-11-0-aarch64-qr/opt:
+    build-platform: android-aarch64/opt
+    test-sets:
+        - android-hw-browsertime
+#        - android-hw-browsertime-power
+
+android-hw-a51-11-0-aarch64-shippable-qr/opt:
+    build-platform: android-aarch64-shippable/opt
+    test-sets:
+        - android-hw-browsertime
+#        - android-hw-browsertime-power
+
+# android-hw-p5-13-0 Google Pixel 5 Android 13.0
+
+android-hw-p5-13-0-arm7-qr/opt:
+    build-platform: android-arm/opt
+    test-sets:
+        - android-hw-arm7-pgo-unittests
+
+android-hw-p5-13-0-arm7-shippable-qr/opt:
+    build-platform: android-arm-shippable/opt
+    test-sets:
+        - android-hw-arm7-pgo-unittests
+
+android-hw-p5-13-0-arm7-qr/debug:
+    build-platform: android-arm/debug
+    test-sets:
+        - android-hw-arm7-debug-unittests
+
+android-hw-p5-13-0-android-aarch64-qr/debug:
+    build-platform: android-aarch64/debug
+    test-sets:
+        - android-hw-aarch64
+        - android-hw-aarch64-debug-unittests
+
+android-hw-p5-13-0-android-aarch64-qr/opt:
+    build-platform: android-aarch64/opt
+    test-sets:
+        - android-hw-aarch64
+        - android-hw-aarch64-opt-unittests
+
+android-hw-p5-13-0-android-aarch64-shippable-qr/opt:
+    build-platform: android-aarch64-shippable/opt
+    test-sets:
+        - android-hw-aarch64
+        - android-hw-aarch64-pgo-unittests
diff --git a/taskcluster/ci/test/test-sets.yml b/taskcluster/ci/test/test-sets.yml
new file mode 100644
index 0000000000..68c257fb04
--- /dev/null
+++ b/taskcluster/ci/test/test-sets.yml
@@ -0,0 +1,479 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+# Each key in this file specifies a set of tests to run.  Different test sets
+# may, for example, be bound to different test platforms.
+#
+# Note that set does not depend on the tree; tree-dependent job selection
+# should be performed in the target task selection phase of task-graph
+# generation.
+#
+# A test set has a name, and a list of tests that it contains.
+#
+# Test names given here reference tests.yml.
+
+### Feature-specific test groups
+
+web-platform-tests:
+    - web-platform-tests
+    - web-platform-tests-crashtest
+    - web-platform-tests-print-reftest
+    - web-platform-tests-reftest
+    - web-platform-tests-wdspec
+    - web-platform-tests-webgpu
+
+web-platform-tests-backlog:
+    - web-platform-tests-backlog
+    - web-platform-tests-reftest-backlog
+
+mochitest-devtools-chrome:
+    - mochitest-devtools-chrome
+
+mochitest-webgpu:
+    - mochitest-webgpu
+
+talos:
+    - talos-bcv
+    - talos-chrome
+    - talos-damp-inspector
+    - talos-damp-webconsole
+    - talos-damp-other
+    - talos-dromaeojs
+    - talos-g1
+    - talos-g3
+    - talos-g4
+    - talos-g5
+    - talos-other
+    - talos-sessionrestore-many-windows
+    - talos-svgr
+    - talos-tp5o
+    - talos-perf-reftest
+    - talos-perf-reftest-singletons
+    - talos-tabswitch
+    - talos-realworld-webextensions
+    - talos-webgl
+    # - talos-h1 Bug 1487031 - Disabled for not finding actionable regressions
+    # - talos-h2 Bug 1487031 - Disabled for not finding actionable regressions
+
+talos-profiling:
+    - talos-bcv-profiling
+    - talos-chrome-profiling
+    # - talos-damp-profiling - Disabled b/c of Bug 1597734
+    - talos-dromaeojs-profiling
+    - talos-g1-profiling
+    - talos-g3-profiling
+    - talos-g4-profiling
+    - talos-g5-profiling
+    - talos-motionmark-profiling
+    - talos-other-profiling
+    - talos-sessionrestore-many-windows-profiling
+    - talos-perf-reftest-profiling
+    - talos-perf-reftest-singletons-profiling
+    - talos-svgr-profiling
+    - talos-tp5o-profiling
+    - talos-tabswitch-profiling
+    - talos-realworld-webextensions-profiling
+    - talos-webgl-profiling
+
+talos-ref-hw:
+    - talos-webgl
+
+browsertime:
+    - browsertime-tp6
+    - browsertime-tp6-essential
+    - browsertime-tp6-bytecode
+    - browsertime-tp6-live
+    - browsertime-tp6-live-sheriffed
+    - browsertime-benchmark
+    - browsertime-benchmark-wasm
+    - browsertime-youtube-playback
+    - browsertime-youtube-playback-power
+    - browsertime-custom
+    - browsertime-first-install
+    - browsertime-responsiveness
+    - browsertime-regression-tests
+    - browsertime-upload
+
+browsertime-clang:
+    - browsertime-tp6
+    - browsertime-tp6-essential
+    - browsertime-tp6-bytecode
+    - browsertime-tp6-live
+    - browsertime-tp6-live-sheriffed
+    - browsertime-benchmark
+    - browsertime-benchmark-wasm
+    - browsertime-youtube-playback
+    - browsertime-responsiveness
+
+browsertime-profiling:
+    - browsertime-tp6-profiling
+
+browsertime-high-priority:
+    - browsertime-benchmark
+    - browsertime-tp6
+
+awsy:
+    - awsy
+    - awsy-base
+    - awsy-dmd
+    - awsy-base-dmd
+    - awsy-tp6
+
+ccov-code-coverage-tests:
+    - test-coverage
+    - test-coverage-wpt
+
+mochitest-valgrind:
+    - mochitest-valgrind
+
+desktop-screenshot-capture:
+    - browser-screenshots
+
+### Specific platform test sets
+
+# Linux
+linux32-gtest:
+    - gtest
+
+linux32-tests:
+    - web-platform-tests
+
+linux1804-tests:
+    - cppunit
+    - crashtest
+    - firefox-ui-functional
+    - gtest
+    # - jittest  # See comment in linux1804-ccov-tests set.
+    - jsreftest
+    - marionette
+    - mochitest-a11y
+    - mochitest-browser-a11y
+    - mochitest-browser-chrome
+    - mochitest-browser-media
+    - mochitest-chrome
+    - mochitest-chrome-gpu
+    - mochitest-devtools-chrome
+    - mochitest-media
+    - mochitest-plain
+    - mochitest-plain-gpu
+    - mochitest-remote
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - reftest
+    - reftest-snapshot
+    - telemetry-tests-client
+    - test-verify
+    - test-verify-gpu
+    - test-verify-wpt
+    - xpcshell
+
+linux1804-ccov-tests:
+    # jittest run on regular linux builds is redundant with SM(p), so we omit it
+    # from the linux1804-tests and linux1804-qr-tests sets. But, we still want
+    # to run it on ccov builds, so we have this set that has it and which runs
+    # on ccov builds.
+    - jittest
+
+linux2204-wayland-tests:
+    - mochitest-plain
+    - cppunit
+    - crashtest
+    - firefox-ui-functional
+    - gtest
+    - jsreftest
+    - marionette
+    - mochitest-a11y
+    - mochitest-browser-a11y
+    - mochitest-browser-chrome
+    - mochitest-browser-media
+    - mochitest-chrome
+    - mochitest-chrome-gpu
+    - mochitest-devtools-chrome
+    - mochitest-media
+    - mochitest-plain
+    - mochitest-plain-gpu
+    - mochitest-remote
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - reftest
+    - reftest-snapshot
+    - telemetry-tests-client
+    - test-verify
+    - test-verify-gpu
+    - test-verify-wpt
+    - xpcshell
+
+# Windows
+
+windows-7-tests:
+    - cppunit
+    - crashtest
+    - gtest
+    - mochitest-browser-a11y
+    - mochitest-browser-chrome
+    - mochitest-browser-media
+    - mochitest-media
+    - xpcshell
+
+windows32-2009-tests:
+    - cppunit
+    - crashtest
+    - gtest
+    - firefox-ui-functional
+    - jsreftest
+    - marionette
+    - mochitest-a11y
+    - mochitest-chrome
+    - mochitest-chrome-gpu
+    - mochitest-media
+    - mochitest-plain
+    - mochitest-plain-gpu
+    - mochitest-remote
+    - mochitest-webgpu
+    - reftest
+    - telemetry-tests-client
+    - test-verify
+    - test-verify-gpu
+    - test-verify-wpt
+
+windows10-2009-tests:
+    - cppunit
+    - gtest
+    - mochitest-chrome
+    - mochitest-chrome-gpu
+    - mochitest-plain
+    - mochitest-plain-gpu
+    - xpcshell
+
+windows11-64-2009-ccov-tests:
+    - jittest
+    - test-coverage
+    - web-platform-tests
+    - web-platform-tests-crashtest
+    - web-platform-tests-print-reftest
+    - web-platform-tests-reftest
+    - web-platform-tests-wdspec
+
+windows11-2009-tests:
+    - cppunit
+    - crashtest
+    - firefox-ui-functional
+    - gtest
+    - jsreftest
+    - marionette
+    - mochitest-a11y
+    - mochitest-browser-a11y
+    - mochitest-browser-chrome
+    - mochitest-browser-media
+    - mochitest-chrome
+    - mochitest-chrome-gpu
+    - mochitest-devtools-chrome
+    - mochitest-media
+    - mochitest-plain
+    - mochitest-plain-gpu
+    - mochitest-remote
+    - mochitest-webgpu
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - reftest
+    - telemetry-tests-client
+    - test-verify
+    - test-verify-gpu
+    - test-verify-wpt
+    - xpcshell
+
+mingwclang-tests-debug:
+    - cppunit
+    - firefox-ui-functional
+    - mochitest-a11y
+    - mochitest-chrome-gpu
+    - mochitest-plain-gpu
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - mochitest-webgpu
+    - reftest
+    - telemetry-tests-client
+
+# The following is the same as the above block, minus reftests.
+# Reftests were disabled due to frequent hangs; see bug 1642719
+# for re-enabling.
+mingwclang-win32-tests-debug:
+    - cppunit
+    - firefox-ui-functional
+    - mochitest-a11y
+    - mochitest-chrome-gpu
+    - mochitest-plain-gpu
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - mochitest-webgpu
+    # - reftest - disabled, see bug 1642719
+    - telemetry-tests-client
+
+mingwclang-tests-opt:
+    - cppunit
+    - mochitest-chrome-gpu
+    - mochitest-plain-gpu
+
+windows-talos:
+    - talos-bcv
+    - talos-chrome
+    - talos-damp-inspector
+    - talos-damp-webconsole
+    - talos-damp-other
+    - talos-dromaeojs
+    - talos-g1
+    - talos-g4
+    - talos-g5
+    - talos-other
+    - talos-sessionrestore-many-windows
+    - talos-perf-reftest
+    - talos-perf-reftest-singletons
+    - talos-svgr
+    - talos-tp5o
+    - talos-tabswitch
+    - talos-realworld-webextensions
+    - talos-webgl
+    # - talos-h1 Bug 1487031 - Disabled for not finding actionable regressions
+
+talos-xperf:
+    - talos-xperf
+
+# macOS
+macosx1100-64-jittests:
+    - jittest
+
+macosx1100-64-qr-tests:
+    - crashtest
+    - jsreftest
+    - mochitest-browser-a11y
+    - mochitest-browser-chrome
+    - mochitest-browser-media
+    - mochitest-chrome-gpu
+    - mochitest-media
+    - mochitest-webgpu
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - reftest
+    - xpcshell
+
+macosx1015-64-qr-tests:
+    - cppunit
+    - crashtest
+    - firefox-ui-functional
+    - gtest
+    - jittest
+    - jsreftest
+    - marionette
+    - mochitest-a11y
+    - mochitest-browser-a11y
+    - mochitest-browser-chrome
+    - mochitest-browser-media
+    - mochitest-chrome
+    - mochitest-chrome-gpu
+    - mochitest-devtools-chrome
+    - mochitest-media
+    - mochitest-plain
+    - mochitest-plain-gpu
+    - mochitest-remote
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+    - mochitest-webgl2-ext
+    - mochitest-webgpu
+    - reftest
+    - telemetry-tests-client
+    - test-verify
+    - test-verify-gpu
+    - test-verify-wpt
+    - xpcshell
+
+macosx64-talos:
+    - talos-bcv
+    - talos-chrome
+    - talos-damp-inspector
+    - talos-damp-webconsole
+    - talos-damp-other
+    - talos-dromaeojs
+    - talos-g1
+    - talos-g4
+    - talos-g5
+    - talos-other
+    - talos-sessionrestore-many-windows
+    - talos-svgr
+    - talos-tp5o
+    - talos-perf-reftest
+    - talos-perf-reftest-singletons
+    - talos-realworld-webextensions
+    - talos-webgl
+    # - talos-tabswitch # Bug 1453007 times out
+    # - talos-h1 # too long to unpack profile- Bug 1442893
+
+# Android
+
+android-x86_64-tests:
+    - cppunit
+    - crashtest
+    - geckoview-junit
+    - gtest
+    - mochitest-media
+    - mochitest-plain
+    - mochitest-plain-gpu
+    # - mochitest-webgl1-core # Harness issues?
+    # - mochitest-webgl1-ext
+    # - mochitest-webgl2-core # Emulator not creating ES3?
+    # - mochitest-webgl2-ext
+    - reftest
+    - test-verify
+    - web-platform-tests
+    - web-platform-tests-crashtest
+    - web-platform-tests-reftest
+    - web-platform-tests-wdspec
+    - xpcshell
+
+android-hw-aarch64-opt-unittests:
+    - jittest
+
+android-hw-arm7-pgo-unittests:
+    - jittest-all
+
+android-hw-aarch64-pgo-unittests:
+    - jittest
+
+android-hw-arm7-debug-unittests:
+    - jittest
+
+android-hw-aarch64-debug-unittests:
+    - jittest
+
+android-hw-aarch64:
+    - crashtest-qr
+    - reftest-qr
+    - mochitest-media
+    - mochitest-webgl1-core
+    - mochitest-webgl1-ext
+    - mochitest-webgl2-core
+
+android-hw-browsertime:
+    - browsertime-tp6m
+    - browsertime-tp6m-essential
+    - browsertime-tp6m-live
+    - browsertime-speedometer-mobile
+    - browsertime-speedometer3-mobile
+    - browsertime-youtube-playback-mobile
+    - browsertime-unity-webgl-mobile
+
+android-hw-browsertime-profiling:
+    - browsertime-tp6m-profiling
diff --git a/taskcluster/ci/test/variants.yml b/taskcluster/ci/test/variants.yml
new file mode 100644
index 0000000000..9777cc3cec
--- /dev/null
+++ b/taskcluster/ci/test/variants.yml
@@ -0,0 +1,290 @@
+---
+1proc:
+    description: "{description} with e10s disabled"
+    component: "Testing::General"
+    expiration: "never"
+    suffix: "1proc"
+    merge:
+        mozharness:
+            extra-options:
+                - "--disable-e10s"
+                - "--disable-fission"
+
+headless:
+    description: "{description} without a window"
+    component: "Firefox::Headless"
+    expiration: "never"
+    suffix: "headless"
+    replace:
+        tier: 2
+    merge:
+        mozharness:
+            extra-options:
+                - "--headless"
+
+a11y-checks:
+    description: "{description} with accessibility checks enabled"
+    component: "Core::Disability Access APIs"
+    expiration: "2023-09-01"
+    suffix: "a11y-checks"
+    replace:
+        tier: 2
+    merge:
+        mozharness:
+            extra-options:
+                - "--enable-a11y-checks"
+
+aab:
+    description: "{description} with aab test_runner"
+    component: "GeckoView::General"
+    expiration: "2023-09-01"
+    when: &gv_e10s_filter
+        $eval: '"android" in task["test-platform"]'
+    suffix: "aab"
+    # Need to add jdk but there isn't a good way to do that
+    # so we just replace the toolchain list
+    merge:
+        fetches:
+            toolchain:
+                - android-system-image-x86_64-linux
+                - android-avd-x86_64-linux
+                - android-emulator-linux
+                - linux64-minidump-stackwalk
+                - linux64-fix-stacks
+                - linux64-jdk
+    replace:
+        target: "geckoview-test_runner.aab"
+
+geckoview-no-fission:
+    description: "{description} without fission enabled"
+    component: "Core::DOM: Content Processes"
+    expiration: "2023-09-01"
+    when:
+        <<: *gv_e10s_filter
+    suffix: "nofis"
+    merge:
+        mozharness:
+            extra-options:
+                - "--disable-fission"
+
+geckoview-fission:
+    description: "{description} with fission enabled"
+    component: "Core::DOM: Content Processes"
+    expiration: "2023-09-01"
+    when:
+        <<: *gv_e10s_filter
+    suffix: "fis"
+
+fission:
+    description: "{description} with fission enabled"
+    component: "Core::DOM: Content Processes"
+    expiration: "2023-09-01"
+    suffix: "fis"
+
+no-fission:
+    description: "{description} without fission enabled"
+    component: "Core::DOM: Content Processes"
+    expiration: "2023-09-01"
+    suffix: "nofis"
+    merge:
+        mozharness:
+            extra-options:
+                - "--disable-fission"
+
+xorigin:
+    description: "{description} with cross-origin"
+    component: "Core::DOM: Content Processes"
+    expiration: "2023-09-01"
+    suffix: "xorig"
+    replace:
+        e10s: true
+    merge:
+        mozharness:
+            extra-options:
+                - "--enable-xorigin-tests"
+                - "--setpref=privacy.partition.always_partition_third_party_non_cookie_storage=false"
+
+editor-legacy-direction:
+    description: "{description} with compatible join/split node direction of editor disabled"
+    component: "Core::DOM: Editor"
+    expiration: "2023-09-01"
+    suffix: "editor-legacy-dir"
+    replace:
+        tier: 2
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=editor.join_split_direction.compatible_with_the_other_browsers=false"
+
+conditioned_profile:
+    description: "{description} with conditioned profile"
+    component: "Testing::General"
+    expiration: "2023-09-01"
+    suffix: "condprof"
+    merge:
+        mozharness:
+            extra-options:
+                - "--conditioned-profile"
+    replace:
+        chunks: 8
+
+socketprocess:
+    description: "{description} with socket process enabled"
+    component: "Core::Networking"
+    expiration: "2023-08-01"
+    suffix: "spi"
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=media.peerconnection.mtransport_process=true"
+                - "--setpref=network.process.enabled=true"
+
+socketprocess_networking:
+    description: "{description} with networking on socket process enabled"
+    component: "Core::Networking"
+    expiration: "2023-08-01"
+    suffix: "spi-nw"
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=network.process.enabled=true"
+                - "--setpref=network.http.network_access_on_socket_process.enabled=true"
+
+# -
+# Webrender DComp variants for Win10
+
+webrender-dcomp-disabled:
+    description: "{description} with dcomp disabled"
+    component: "Core::Graphics: WebRender"
+    expiration: "2023-09-01"
+    suffix: "wr-dc0"
+    when:
+        $eval: '"windows1" in task["test-platform"]'
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=gfx.webrender.dcomp-win.enabled=false"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win=false"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win.force-enabled=false"
+                - "--setpref=gfx.webrender.compositor=false"
+                - "--setpref=gfx.webrender.compositor.force-enabled=false"
+
+webrender-dcomp-present:  # Default variant ends up like this.
+    description: "{description} with dcomp present but not overlays"
+    component: "Core::Graphics: WebRender"
+    expiration: "2023-09-01"
+    suffix: "wr-dc1-p"
+    when:
+        $eval: '"windows1" in task["test-platform"]'
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=gfx.webrender.dcomp-win.enabled=true"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win=false"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win.force-enabled=false"
+                - "--setpref=gfx.webrender.compositor=false"
+                - "--setpref=gfx.webrender.compositor.force-enabled=false"
+
+webrender-dcomp-overlays:
+    description: "{description} with dcomp overlays but not compositing"
+    component: "Core::Graphics: WebRender"
+    expiration: "2023-09-01"
+    suffix: "wr-dc2-o"
+    when:
+        $eval: '"windows1" in task["test-platform"]'
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=gfx.webrender.dcomp-win.enabled=true"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win=true"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win.force-enabled=true"
+                - "--setpref=gfx.webrender.compositor=false"
+                - "--setpref=gfx.webrender.compositor.force-enabled=false"
+
+webrender-dcomp-compositing:
+    description: "{description} with dcomp compositing"
+    component: "Core::Graphics: WebRender"
+    expiration: "2023-09-01"
+    suffix: "wr-dc3-c"
+    when:
+        $eval: '"windows1" in task["test-platform"]'
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=gfx.webrender.dcomp-win.enabled=true"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win=true"
+                - "--setpref=gfx.webrender.dcomp-video-overlay-win.force-enabled=true"
+                - "--setpref=gfx.webrender.compositor=true"
+                - "--setpref=gfx.webrender.compositor.force-enabled=true"
+
+# -
+
+webrender-sw:
+    description: "{description} with software webrender enabled"
+    component: "Core::Graphics: WebRender"
+    expiration: "2023-09-01"
+    suffix: "swr"
+    merge:
+        webrender: true
+        mozharness:
+            extra-options:
+                - "--setpref=gfx.webrender.software=true"
+
+webgl-ipc:
+    description: "{description} with WebGL IPC process enabled"
+    component: "Core::Graphics: CanvasWebGL"
+    expiration: "2023-09-01"
+    suffix: "gli"
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=webgl.out-of-process=true"
+                - "--setpref=security.sandbox.content.headless=true"
+
+devtools-no-eft:
+    description: "{description} with DevTools EFT disabled"
+    component: "DevTools::Framework"
+    expiration: "2023-09-01"
+    suffix: "dt-no-eft"
+    merge:
+        mozharness:
+            extra-options:
+                - "--setpref=devtools.every-frame-target.enabled=false"
+
+wmf-media-engine:
+    description: "{description} with Windows Media Foundation media engine enabled"
+    component: "Core::Audio/Video: Playback"
+    expiration: "2023-10-10"
+    when:
+        $eval: '"windows1" in task["test-platform"]'
+    suffix: "wmfme"
+    replace:
+        tier: 2
+    merge:
+        mozharness:
+            extra-options:
+                - "--tag=media-engine-compatible"
+                - "--setpref=media.wmf.media-engine.enabled=true"
+                - "--setpref=media.wmf.media-engine.channel-decoder.enabled=true"
+
+msix:
+    description: "{description} from msix packages"
+    component: "Firefox:Installer"
+    expiration: "never"
+    suffix: "msix"
+    when:
+        $eval: '"windows1" in task["test-platform"] && "-64" in task["test-platform"] && ("opt" in task["test-platform"] || "debug" in task["test-platform"]) && !("asan" in task["test-platform"]) && !("ccov" in task["test-platform"])'
+    merge:
+        mozharness:
+            extra-options:
+                - "--installer-path installer.msix"
+
+http3:
+    description: "{description} with http3 server"
+    component: "Testing::General"
+    expiration: "2023-09-01"
+    suffix: "http3"
+    merge:
+        mozharness:
+            extra-options:
+                - "--use-http3-server"
diff --git a/taskcluster/ci/test/web-platform.yml b/taskcluster/ci/test/web-platform.yml
new file mode 100644
index 0000000000..cea5f5e3e6
--- /dev/null
+++ b/taskcluster/ci/test/web-platform.yml
@@ -0,0 +1,494 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite:
+        category: web-platform-tests
+    instance-size: xlarge
+    max-run-time:
+        by-test-platform:
+            android-em-7.0-x86_64/debug: 7200
+            default: 5400
+    mozharness:
+        script: web_platform_tests.py
+        config:
+            by-test-platform:
+                windows.*:
+                    - web_platform_tests/prod_config_windows_taskcluster.py
+                macosx.*:
+                    - web_platform_tests/prod_config_mac.py
+                android-em.*:
+                    - android/android-x86_64.py
+                    - web_platform_tests/prod_config_android.py
+                default:
+                    - web_platform_tests/prod_config.py
+                    - remove_executables.py
+    target:
+        by-test-platform:
+            android-em-7.0-x86_64-shippable(-lite)?-qr/opt: geckoview-test_runner.apk
+            android-em-7.0-x86_64(-lite)?-qr/opt: geckoview-test_runner.apk
+            android-em-7.0-x86_64(-lite)?-qr/debug(-isolated-process)?: geckoview-test_runner.apk
+            default: null
+
+web-platform-tests:
+    description: "Web platform test run"
+    suite: web-platform-tests
+    treeherder-symbol: W(wpt)
+    virtualization: virtual
+    tier:
+        by-test-platform:
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            default: default
+    chunks:
+        by-test-platform:
+            android.*/debug: 32
+            android.*: 24
+            linux.*64-tsan-qr/opt: 32
+            linux.*64-asan(-qr)?/opt: 22
+            linux.*64-ccov.*/opt: 20
+            linux.*/debug: 16
+            macosx.*/debug: 18
+            windows.*32.*/opt: 12
+            windows.*/debug: 16
+            windows.*-ccov.*/opt: 14
+            default: 10
+    max-run-time:
+        by-test-platform:
+            .*-ccov.*/.*: 10800
+            linux.*64(-tsan|-asan)-qr/opt: 14400
+            linux.*64(-qr)?/debug: 10800
+            macosx.*/debug: 10800
+            android-em.*/.*: 10800
+            default: 7200
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+        - webrender-sw
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    .*-32.*/.*: []
+                    linux.*64-qr/debug: built-projects
+                    windows.*-qr/debug: built-projects
+                    android-em-7.0-x86_64-qr/debug: []
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    .*-32.*/.*: []
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux.*64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    android.*: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    mozharness:
+        chunked: true
+        extra-options:
+            - --test-type=testharness
+            - --skip-implementation-status=backlog
+            - --skip-implementation-status=not-implementing
+            # Because we have a separate job for them, don't run the (core)
+            # webgpu/* tests in the main WPT runs. (but still run tests in dirs
+            # other than webgpu/* that are tagged webgpu, e.g. canvas tests)
+            - --exclude=webgpu
+            # Remove after webgpu tests move back to upstream WPT repo:
+            - --exclude=_mozilla/webgpu
+
+web-platform-tests-backlog:
+    description: "Web platform test (backlog) run"
+    treeherder-symbol: W-b(wpt)
+    variants:
+        - no-fission
+    chunks:
+        by-test-platform:
+            android.*: 3
+            default: 1
+    max-run-time:
+        by-test-platform:
+            android.*/opt: 7200
+            default: 3600
+    run-on-projects:
+        by-variant:
+            no-fission:
+                by-test-platform:
+                    android.*: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: ['mozilla-central']
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier: 2
+    mozharness:
+        chunked: true
+        extra-options:
+            - --test-type=testharness
+            - --skip-implementation-status=implementing
+            - --skip-implementation-status=not-implementing
+            - --backlog
+
+web-platform-tests-reftest:
+    description: "Web platform reftest run"
+    schedules-component: web-platform-tests-reftest
+    treeherder-symbol: W(Wr)
+    virtualization:
+        by-test-platform:
+            windows.*-64.*-qr/.*: virtual-with-gpu
+            default: virtual
+    chunks:
+        by-test-platform:
+            .*-ccov.*/.*: 8
+            linux.*64-tsan-qr/opt: 16
+            linux1804-64(-asan)?-qr/.*: 6
+            macosx10.*-64/debug: 6
+            macosx10.*-64/opt: 3
+            windows.*-(32|64)(-qr)?/debug: 5
+            android.*: 6
+            default: 4
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+        - webrender-sw
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    .*-32.*/.*: []
+                    linux.*64-qr/debug: built-projects
+                    windows.*-qr/debug: built-projects
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    tier:
+        by-test-platform:
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            default: default
+    mozharness:
+        extra-options:
+            - --test-type=reftest
+            - --skip-implementation-status=backlog
+            - --skip-implementation-status=not-implementing
+
+web-platform-tests-webgpu:
+    description: "Web platform WebGPU test run"
+    suite: web-platform-tests
+    treeherder-symbol: W(webgpu)
+    virtualization: virtual
+    tier: default
+    chunks: 2
+    max-run-time: 7200
+    variants: []  # We don't need sw or nofis testing.
+    run-on-projects:
+        by-test-platform:
+            android.*: []
+            macos.*: []
+            .*wayland.*: []
+            default: ['trunk']
+    mozharness:
+        chunked: true
+        extra-options:
+            - --test-type=testharness
+            - --default-exclude
+            - --tag=webgpu
+
+web-platform-tests-reftest-backlog:
+    description: "Web platform reftest (backlog) run"
+    schedules-component: web-platform-tests-reftest
+    treeherder-symbol: W-b(Wr)
+    virtualization: virtual
+    chunks: 1
+    variants:
+        - no-fission
+    run-on-projects:
+        by-variant:
+            no-fission:
+                by-test-platform:
+                    android.*: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: ['mozilla-central']
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier: 2
+    mozharness:
+        extra-options:
+            - --test-type=reftest
+            - --skip-implementation-status=implementing
+            - --skip-implementation-status=not-implementing
+            - --backlog
+
+web-platform-tests-wdspec:
+    description: "Web platform webdriver-spec run"
+    schedules-component: web-platform-tests-wdspec
+    treeherder-symbol: W(Wd)
+    chunks:
+        by-test-platform:
+            .*-ccov.*/.*: 4
+            .*-tsan.*/.*: 8
+            default: 3
+    mozharness:
+        extra-options:
+            by-test-platform:
+                android-em-7.*:
+                    - --test-type=wdspec
+                    - --setpref=gfx.canvas.accelerated=false
+                default:
+                    - --test-type=wdspec
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+        - webrender-sw
+        - headless
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: []
+                    .*-32.*/.*: []
+                    linux.*64-qr/debug: built-projects
+                    windows.*-qr/debug: built-projects
+                    default: []
+            headless:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+            no-fission:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    tier: default
+    fetches:
+        toolchain:
+            by-test-platform:
+                android-em-7.*:
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - android-emulator-linux
+                    - linux64-geckodriver
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                linux.*64.*:
+                    - linux64-geckodriver
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                linux.*32.*:
+                    - linux32-geckodriver
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                macosx.*:
+                    - macosx64-geckodriver
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*-32.*:
+                    - win32-geckodriver
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                win.*-64.*:
+                    - win64-geckodriver
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                default:
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                    - linux64-geckodriver
+
+web-platform-tests-crashtest:
+    description: "Web platform crashtests run"
+    schedules-component: web-platform-tests-crashtest
+    treeherder-symbol: W(Wc)
+    chunks: 1
+    mozharness:
+        extra-options:
+            - --test-type=crashtest
+    variants:
+        - no-fission
+        - webrender-sw
+        - webrender-sw+no-fission
+        - editor-legacy-direction
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    .*-32.*/.*: []
+                    linux.*64-qr/debug: built-projects
+                    macosx101.*64-qr/debug: built-projects
+                    windows.*-qr/debug: built-projects
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            editor-legacy-direction:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['mozilla-central']
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    .*wayland.*: []
+                    default: built-projects
+    tier: default
+
+web-platform-tests-print-reftest:
+    description: "Web platform print-reftest run"
+    schedules-component: web-platform-tests-print-reftest
+    treeherder-symbol: W(Wp)
+    chunks: 1
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier: default
+    variants:
+        - no-fission
+        - webrender-sw
+        - webrender-sw+no-fission
+    run-on-projects:
+        by-variant:
+            webrender-sw:
+                by-test-platform:
+                    android.*: []
+                    .*-32.*/.*: []
+                    linux.*64-qr/debug: built-projects
+                    windows.*-qr/debug: built-projects
+                    default: []
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    default: []
+            no-fission:
+                by-test-platform:
+                    linux1804-64-qr/debug: ['trunk']
+                    linux1804-64(-shippable|-asan)?-qr/opt: ['trunk']
+                    android.*: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    default: built-projects
+    mozharness:
+        extra-options:
+            - --test-type=print-reftest
+
+test-verify-wpt:
+    description: "Extra verification of web-platform tests modified on this push"
+    suite:
+        category: test-verify
+        name: test-verify-wpt
+    treeherder-symbol: TVw
+    max-run-time: 10800
+    run-on-projects:
+        by-test-platform:
+            # do not run on asan, ccov, shippable or wayland
+            .*-(asan|ccov|shippable|wayland).*/.*: []
+            # do not run on beta or release: usually just confirms earlier results
+            default: ['integration']
+    built-projects-only: true
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    optimization:
+        test-verify: ["test-verify-wpt"]
+    tier: 2
+    mozharness:
+        extra-options:
+            - --verify
+
+test-coverage-wpt:
+    description: "Per web-platform test coverage"
+    suite:
+        category: test-coverage
+        name: test-coverage-wpt
+    schedules-component: test-coverage-wpt
+    treeherder-symbol: TCw
+    max-run-time: 10800
+    variants:
+        - no-fission
+        - webrender-sw+no-fission
+    run-on-projects:
+        by-variant:
+            webrender-sw+no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    .*-ccov.*/.*: built-projects
+                    default: []
+    test-manifest-loader: null  # don't load tests in the taskgraph
+    tier: 2
+    mozharness:
+        extra-options:
+            - --per-test-coverage
diff --git a/taskcluster/ci/test/xpcshell.yml b/taskcluster/ci/test/xpcshell.yml
new file mode 100644
index 0000000000..583155eb25
--- /dev/null
+++ b/taskcluster/ci/test/xpcshell.yml
@@ -0,0 +1,186 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+job-defaults:
+    suite:
+        category: xpcshell
+        name:
+            by-variant:
+                msix: xpcshell-msix
+                default: xpcshell
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-test_runner.apk
+            windows11-64-2009.*:
+                by-variant:
+                    msix: target.installer.msix
+                    default: null
+            default: null
+    mozharness:
+        script:
+            by-test-platform:
+                android-em.*: android_emulator_unittest.py
+                default: desktop_unittest.py
+        config:
+            by-test-platform:
+                android-em-7.*:
+                    - android/android_common.py
+                    - android/android-x86_64.py
+                linux.*:
+                    - unittests/linux_unittest.py
+                    - remove_executables.py
+                macosx.*:
+                    - unittests/mac_unittest.py
+                windows.*:
+                    - unittests/win_unittest.py
+        requires-signed-builds:
+            by-test-platform:
+                macosx1100.*: true
+                windows.*-asan-qr/opt: false    # No XPCShell on ASAN yet
+                windows.*-mingwclang-qr/.*: false
+                windows.*: true
+                default: false
+
+xpcshell:
+    description: "xpcshell test run"
+    treeherder-symbol: X(X)
+    variants:
+        - conditioned_profile
+        - socketprocess_networking+no-fission
+        - socketprocess_networking
+        - no-fission
+        - msix
+    run-on-projects:
+        by-variant:
+            conditioned_profile:
+                by-test-platform:
+                    .*asan.*: []
+                    .*ccov.*: []
+                    (linux1804-64|windows11-64.*)(-shippable)?-qr/opt: ['trunk']
+                    default: []
+            socketprocess_networking+no-fission:
+                by-test-platform:
+                    linux1804-64.*: ['trunk']
+                    default: []
+            socketprocess_networking:
+                by-test-platform:
+                    (linux1804-64|macosx).*: ['trunk']  # All Linux & Mac variants
+                    windows7-32.*: ['trunk']
+                    ^(?!.*asan).*windows11.*: ['trunk']   # All Windows11 except ASAN
+                    default: []
+            no-fission:
+                by-test-platform:
+                    android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    android.*: built-projects
+                    linux1804-64.*: ['trunk']
+                    default: []
+            msix:
+                by-test-platform:
+                    windows11-64-2009(-shippable)?-qr/opt: built-projects
+                    windows11-64-2009-qr/debug: built-projects
+                    default: []
+            default:
+                by-test-platform:
+                    android.*: []
+                    .*wayland.*: []
+                    windows.*-asan-qr/opt: []  # No XPCShell on ASAN yet
+                    default: built-projects
+    chunks:
+        by-test-platform:
+            .*-asan-qr/opt: 4
+            .*-ccov.*/.*: 8
+            .*-tsan-qr/opt: 8
+            (android-em-7.*|macosx.*|linux1804-64.*/opt): 2
+            default: 4
+    max-run-time:
+        by-variant:
+            msix: 7200
+            conditioned_profile: 7200
+            default:
+                by-test-platform:
+                    .*-ccov(-qr)?/.*: 7200
+                    .*-tsan-qr/opt: 7200
+                    default: 5400
+    allow-software-gl-layers: false
+    tier:
+        by-test-platform:
+            windows.*-asan.*: 3
+            android-em-7.0-x86_64-qr/debug-isolated-process: 3
+            default: default
+    mozharness:
+        extra-options:
+            by-test-platform:
+                windows1.*:
+                    - --threads=2
+                default: []
+    fetches:
+        toolchain:
+            by-test-platform:
+                # xpcshell-tests are limited to *-node-12 as node 14+ dropped
+                # support for Windows 7. Once support for Windows 7 is dropped
+                # (bug 1594270) we should be able to revert these to the latest
+                # node version (*-node).
+                linux.*:
+                    - linux64-node-12
+                    - linux64-minidump-stackwalk
+                    - linux64-fix-stacks
+                macosx.*:
+                    - macosx64-node-12
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*-64.*:
+                    - win64-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                win.*32.*:
+                    - win32-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks
+                android-em-7.*:
+                    - android-system-image-x86_64-linux
+                    - android-avd-x86_64-linux
+                    - android-emulator-linux
+                    - linux64-node-12
+                    - linux64-minidump-stackwalk
+
+xpcshell-failures:
+    description: "xpcshell specific failures test run"
+    treeherder-symbol: X-f(X)
+    run-on-projects: ["mozilla-central"]
+    chunks: 2
+    max-run-time: 2700
+    allow-software-gl-layers: false
+    tier: 3
+    mozharness:
+        script:
+            by-test-platform:
+                macos.*: mac_unittest.py
+                windows1.*: desktop_unittest.py
+        config:
+            by-test-platform:
+                macos.*:
+                    - unittests/mac_unittest.py
+                windows1.*:
+                    - unittests/win_unittest.py
+        extra-options:
+            by-test-platform:
+                macosx1100.*:
+                    - --run-failures=apple_silicon
+                    - --timeout-as-pass
+                    - --crash-as-pass
+    fetches:
+        toolchain:
+            by-test-platform:
+                # xpcshell-tests are limited to *-node-12 as node 14+ dropped
+                # support for Windows 7. Once support for Windows 7 is dropped
+                # (bug 1594270) we should be able to revert these to the latest
+                # node version (*-node).
+                macosx.*:
+                    - macosx64-node-12
+                    - macosx64-minidump-stackwalk
+                    - macosx64-fix-stacks
+                win.*32.*:
+                    - win32-node-12
+                    - win32-minidump-stackwalk
+                    - win32-fix-stacks