Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

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+# Are We Slim Yet (AWSY)
+
+The Are We Slim Yet project (commonly known as AWSY) for several years
+tracked memory usage across builds on the (now defunct) website.
+It used the same
+infrastructure as
+[about:memory](about_colon_memory.md) to measure
+memory usage on a predefined snapshot of Alexa top 100 pages known as
+tp5.
+
+Since Firefox transitioned to using multiple processes by default, we
+[moved AWSY into the
+TaskCluster](https://bugzilla.mozilla.org/show_bug.cgi?id=1272113)
+infrastructure. This allowed us to run measurements on all branches and
+platforms. The results are posted to
+[perfherder](https://treeherder.mozilla.org/perf.html) where we can
+track regressions automatically.
+
+As new processes are added to Firefox we want to make sure their memory
+usage is also tracked by AWSY. To this end we request that memory
+reporting be integrated into any new process before it is enabled on
+Nightly.