Adding upstream version 115.8.0esr.upstream/115.8.0esr

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

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+Gecko Profiler
+==============
+
+The Firefox Profiler is the collection of tools used to profile Firefox. This is backed
+by the Gecko Profiler, which is the primarily C++ component that instruments Gecko. It
+is configurable, and supports a variety of data sources and recording modes. Primarily,
+it is used as a statistical profiler, where the execution of threads that have been
+registered with the profile is paused, and a sample is taken. Generally, this includes
+a stackwalk with combined native stack frame, JavaScript stack frames, and custom stack
+frame labels.
+
+In addition to the sampling, the profiler can collect markers, which are collected
+deterministically (as opposed to statistically, like samples). These include some
+kind of text description, and optionally a payload with more information.
+
+This documentation serves to document the Gecko Profiler and Base Profiler components,
+while the profiler.firefox.com interface is documented at `profiler.firefox.com/docs/ <https://profiler.firefox.com/docs/>`_
+
+.. toctree::
+   :maxdepth: 1
+
+   code-overview
+   buffer
+   instrumenting-javascript
+   instrumenting-rust
+   markers-guide
+   memory
+
+The following areas still need documentation:
+
+ * LUL
+ * Instrumenting Java
+ * Registering Threads
+ * Samples and Stack Walking
+ * Triggering Gecko Profiles in Automation
+ * JS Tracer
+ * Serialization