I can't comment on how much the extensions might have affected things, but startup time was significantly improved: https://wiki.mozilla.org/Firefox/Sprints/Sta

I can't comment on how much the extensions might have affected things, but startup time was significantly improved: https://wiki.mozilla.org/Firefox/Sprints/Startup_Time_Improvements https://wiki.mozilla.org/Firefox/Sprints/Startup_Time_Improv...