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Debugging
For other debugging resources, see also: Remote project wiki
Increasing the logging verbosity
To increase the internal logging verbosity you can use the
remote.log.level preference.
If you use mach to start Firefox:
./mach run --setpref "remote.log.level=Trace" --remote-debugging-port
By default, long log lines are truncated. To print long lines in full, you
can set remote.log.truncate to false.
Enabling logging of emitted events
To dump events produced by EventEmitter,
including CDP events produced by the remote agent,
you can use the toolkit.dump.emit preference:
./mach run --setpref "toolkit.dump.emit=true" --remote-debuggiing-port
Logging observer notifications
System observer notifications are used extensively throughout the code and it can sometimes be useful to log these to see what is available and when they are fired.
The MOZ_LOG environment variable controls the C++ logs and takes
the name of the subsystem along with a verbosity setting. See
prlog.h for more details.
MOZ_LOG=ObserverService:5
You can optionally redirect logs away from stdout to a file:
MOZ_LOG_FILE=service.log
This enables LogLevel::Debug level information and places all
output in the file service.log in your current working directory.