Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

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diff --git a/docs/contributing/build/building_mobile_firefox.rst b/docs/contributing/build/building_mobile_firefox.rst
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+Firefox for Mobile Devices
+--------------------------
+
+We have several different mobile products aimed at different tasks,
+devices, and audiences:
+
+-  Building **Firefox for Android** (codename: fenix). Our general-purpose
+   mobile browser is split into several different artifact layers:
+
+  - `The fenix Android application </mobile/android/fenix.html>`_
+  - `The android-components Android library <https://github.com/mozilla-mobile/firefox-android/tree/main/android-components>`_
+  - `The GeckoView platform </mobile/android/geckoview>`_
+
+-  `Firefox for iOS <https://github.com/mozilla-mobile/firefox-ios>`_,
+   our general-purpose browser for iOS with desktop sync built-in.
+-  Building **Firefox Focus**, our privacy-focused browser for
+
+  - `iOS <https://github.com/mozilla-mobile/focus-ios>`_
+  - `Android <https://github.com/mozilla-mobile/firefox-android/tree/main/focus-android>`_. This browser
+    also uses the android-components library and GeckoView platform, like Firefox for Android
+
+For both Desktop and Mobile development, please bear the following in
+mind:
+
+-  While you can build Firefox on older hardware it can take quite a bit
+   of time to compile on slower machines. Having at least 8GB of RAM is
+   recommended, and more is always better. The build process is both CPU
+   and I/O intensive, so building on a machine with an SSD is also
+   strongly preferred.
+-  Fast broadband internet is strongly recommended as well. Both the
+   development environment and the source code repository are quite
+   large.
+-  Though you can build Firefox to run on 32-bit machines, the build
+   process for almost all of our products requires a 64-bit OS.