Rated 5 out of 5 stars

per Jonathan Watt el abr. 6, 2018 ·

Nowadays see https://developer.mozilla.org/en-US/docs/Mozilla/How_to_report_a_hung_Firefox#Submit_a_crash_report_for_a_hung_Firefox

Rated 4 out of 5 stars

per FredMcD el nov. 17, 2016 ·

If Firefox is locked/frozen, this may not work.
Still a good idea.