Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

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+Conditioned Profile
+===================
+
+This project provides a command-line tool that is used to generate and maintain
+a collection of Gecko profiles.
+
+Unlike testing/profiles, the **conditioned profiles** are a collection of full
+Gecko profiles that are dynamically updated every day.
+
+Each profile is created or updated using a **scenario** and a
+**customization**, and eventually uploaded as an artifact in TaskCluster.
+
+The goal of the project is to build a collection of profiles that we can use in
+our performance or functional tests instead of the empty profile that we
+usually create on the fly with **mozprofile**.
+
+Having a collection of realistic profiles we can use when running some tests
+gives us the ability to check the impact of user profiles on page loads or
+other tests.
+
+A full cycle of how this tool is used in Taskcluster looks like this:
+
+For each combination of scenario, customization and platform:
+
+- grabs an existing profile in Taskcluster
+- browses the web using the scenario, via the WebDriver client
+- recreates a tarball with the updated profile
+- uploads it as an index artifact into TaskCluster - maintains a changelog of each change
+
+It's based on the Arsenic webdriver client https://github.com/HDE/arsenic
+
+The project provides two **Mach** commands to interact with the conditioned
+profile:
+
+- **fetch-condprofile**: downloads a conditioned profile and deecompress it
+- **run-condprofile**: runs on or all conditioned profiles scenarii locally
+
+How to download a conditioned profile
+=====================================
+
+From your mozilla-central root, run:
+
+::
+
+    $ ./mach fetch-condprofile
+
+This will grab the latest conditioned profile for your platform. But
+you can also grab a specific profile built from any scenario or platform.
+
+You can look at all the options with --help
+
+How to run a conditioned profile
+================================
+
+If you want to play a scenario locally to modify it, run for example:
+
+::
+
+    $ ./mach run-condprofile --scenario settled --visible /path/to/generated/profile
+
+The project will run a webdriver session against Firefox and generate the profile.
+You can look at all the options with --help
+
+Architecture
+============
+
+The conditioned profile project is organized into webdriver **scenarii** and
+**customization** files.
+
+Scenarii
+--------
+
+Scenarii are coroutines registered under a unique name in condprof/scenarii/__init__.py.
+
+They get a **session** object and some **options**.
+
+The scenario can do whatever it wants with the browser, through the webdriver session
+instance.
+
+See Arsenic's `API documentation <https://arsenic.readthedocs.io/en/latest/reference/session.html>`_ for the session class.
+
+Adding a new scenario is done by adding a module in condprof/scenarii/
+and register it in condprof/scenarii/__init__.py
+
+
+Customization
+-------------
+
+A customization is a configuration file that can be used to set some
+prefs in the browser and install some webextensions.
+
+Customizations are JSON files registered into condprof/customizations,
+and they provide four keys:
+
+- **name**: the name of the customization
+- **addons**: a mapping of add-ons to install.
+- **prefs**: a mapping of prefs to set
+- **scenario**: a mapping of options to pass to a specific scenario
+
+In the example below, we install uBlock, set a pref, and pass the
+**max_urls** option to the **heavy** scenario.
+
+  {
+      "name": "intermediate",
+      "addons":{
+         "uBlock":"https://addons.mozilla.org/firefox/downloads/file/3361355/ublock_origin-1.21.2-an+fx.xpi"
+      },
+      "prefs":{
+         "accessibility.tabfocus": 9
+      },
+      "scenario": {
+         "heavy": {"max_urls": 10}
+      }
+   }