Firefox performance is very important to Mozilla. Mozilla has a dedicated Firefox performance team and some of the team members are "tab hoarders" with (literal

Firefox performance is very important to Mozilla. Mozilla has a dedicated Firefox performance team and some of the team members are "tab hoarders" with (literally) thousands of tabs, so they have a personal interest in keeping Firefox performing well with many tabs. :) If you experience a performance problem, you can use the Firefox profiler to record a performance profile and share it in a Bugzilla bug report. Having a profile makes a performance bug much easier to diagnose and hopefully fix. The profiler is easy to use: it's just a toolbar button to start/stop recording. Here are the instructions for enabling it: https://profiler.firefox.com/ https://profiler.firefox.com/