Adding upstream version 115.8.0esr.upstream/115.8.0esr

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

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+# Preferences
+
+There are a couple of [Remote Agent preferences] associated with the Gecko remote
+protocol. Those listed below are additional ones uniquely used for Marionette.
+
+[Remote Agent preferences]: /remote/Prefs.md
+
+## `marionette.debugging.clicktostart`
+
+Delay server startup until a modal dialogue has been clicked to
+allow time for user to set breakpoints in the [Browser Toolbox].
+
+[Browser Toolbox]: /devtools-user/browser_toolbox/index.rst
+
+## `marionette.port`
+
+Defines the port on which the Marionette server will listen.  Defaults
+to port 2828.
+
+This can be set to 0 to have the system atomically allocate a free
+port, which can be useful when running multiple Marionette servers
+on the same system.  The effective port is written to the user
+preference file when the server has started and is also logged to
+stdout.