Rated 3 out of 5 stars

This addon is really a need but I can confirm the crash on x64.

toaster666 could you share the fix somehow?

This review is for a previous version of the add-on (0.1.1-signed.1-signed). 

NOTE: It seems that the crashes experienced by the users are related to the new Javascript JIT Compiler Called ION Baseline. Disabling it seems to solve the problem. You can disable it by setting javascript.options.baselinejit.* in about:config to false