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diff --git a/docs/conf.py b/docs/conf.py
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+# 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/.
+
+import os
+import sys
+
+# Set up Python environment to load build system packages.
+OUR_DIR = os.path.dirname(__file__)
+topsrcdir = os.path.normpath(os.path.join(OUR_DIR, ".."))
+
+# Escapes $, [, ] and 3 dots in copy button
+copybutton_prompt_text = r">>> |\.\.\. |\$ |In \[\d*\]: | {2,5}\.\.\.: | {5,8}: "
+copybutton_prompt_is_regexp = True
+
+EXTRA_PATHS = (
+    "layout/tools/reftest",
+    "python/mach",
+    "python/mozbuild",
+    "python/mozversioncontrol",
+    "testing/mozbase/manifestparser",
+    "testing/mozbase/mozfile",
+    "testing/mozbase/mozprocess",
+    "testing/mozbase/moznetwork/moznetwork",
+    "third_party/python/jsmin",
+    "third_party/python/which",
+    "docs/_addons",
+    "taskcluster/gecko_taskgraph/test",
+)
+
+sys.path[:0] = [os.path.join(topsrcdir, p) for p in EXTRA_PATHS]
+
+sys.path.insert(0, OUR_DIR)
+
+extensions = [
+    "myst_parser",
+    "sphinx.ext.autodoc",
+    "sphinx.ext.autosectionlabel",
+    "sphinx.ext.doctest",
+    "sphinx.ext.graphviz",
+    "sphinx.ext.napoleon",
+    "sphinx.ext.todo",
+    "mozbuild.sphinx",
+    "sphinx_js",
+    "sphinxcontrib.mermaid",
+    "sphinx_copybutton",
+    "sphinx_markdown_tables",
+    "sphinx_design",
+    "bzlink",
+]
+
+# JSDoc must run successfully for dirs specified, so running
+# tree-wide (the default) will not work currently.
+# When adding more paths to this list, please ensure that they are not
+# excluded from valid-jsdoc in the top-level .eslintrc.js.
+js_source_path = [
+    "../browser/components/extensions",
+    "../browser/components/migration",
+    "../browser/components/migration/content",
+    "../browser/components/uitour",
+    "../browser/components/urlbar",
+    "../remote/marionette",
+    "../testing/mochitest/BrowserTestUtils",
+    "../testing/mochitest/tests/SimpleTest/SimpleTest.js",
+    "../testing/mochitest/tests/SimpleTest/EventUtils.js",
+    "../testing/modules/Assert.sys.mjs",
+    "../testing/modules/TestUtils.sys.mjs",
+    "../toolkit/actors",
+    "../toolkit/components/extensions",
+    "../toolkit/components/extensions/parent",
+    "../toolkit/components/featuregates",
+    "../toolkit/mozapps/extensions",
+    "../toolkit/components/prompts/src",
+    "../toolkit/components/pictureinpicture",
+    "../toolkit/components/pictureinpicture/content",
+    "../toolkit/components/search",
+]
+root_for_relative_js_paths = ".."
+jsdoc_config_path = "jsdoc.json"
+
+templates_path = ["_templates"]
+source_suffix = [".rst", ".md"]
+master_doc = "index"
+project = "Firefox Source Docs"
+
+# Override the search box to use Google instead of
+# sphinx search on firefox-source-docs.mozilla.org
+if (
+    os.environ.get("MOZ_SOURCE_DOCS_USE_GOOGLE") == "1"
+    and os.environ.get("MOZ_SCM_LEVEL") == "3"
+):
+    templates_path.append("_search_template")
+
+html_sidebars = {
+    "**": [
+        "searchbox.html",
+    ]
+}
+html_logo = os.path.join(
+    topsrcdir, "browser/branding/nightly/content/firefox-wordmark.svg"
+)
+html_favicon = os.path.join(topsrcdir, "browser/branding/nightly/firefox.ico")
+
+exclude_patterns = ["_build", "_staging", "_venv", "**security/nss/legacy/**"]
+pygments_style = "sphinx"
+# generate label “slugs” for header anchors so that
+# we can reference them from markdown links.
+myst_heading_anchors = 5
+
+# We need to perform some adjustment of the settings and environment
+# when running on Read The Docs.
+on_rtd = os.environ.get("READTHEDOCS", None) == "True"
+
+if on_rtd:
+    # SHELL isn't set on RTD and mach.mixin.process's import raises if a
+    # shell-related environment variable can't be found. Set the variable here
+    # to hack us into working on RTD.
+    assert "SHELL" not in os.environ
+    os.environ["SHELL"] = "/bin/bash"
+else:
+    # We only need to set the RTD theme when not on RTD because the RTD
+    # environment handles this otherwise.
+    import sphinx_rtd_theme
+
+    html_theme = "sphinx_rtd_theme"
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
+
+html_static_path = ["_static"]
+htmlhelp_basename = "FirefoxTreeDocs"
+
+moz_project_name = "main"
+
+html_show_copyright = False
+
+# Only run autosection for the page title.
+# Otherwise, we have a huge number of duplicate links.
+# For example, the page https://firefox-source-docs.mozilla.org/code-quality/lint/
+# is called "Linting"
+# just like https://firefox-source-docs.mozilla.org/remote/CodeStyle.html
+autosectionlabel_maxdepth = 1
+
+
+def install_sphinx_design(app, pagename, templatename, context, doctree):
+    if "perfdocs" in pagename:
+        app.add_js_file("sphinx_design.js")
+        app.add_css_file("sphinx_design.css")
+
+
+def setup(app):
+    app.add_css_file("custom_theme.css")
+    app.connect("html-page-context", install_sphinx_design)