Comment by SpaghettiCthulu

I have >1000 tabs open and probably many that I haven't looked at in >6 months now (most are discarded using Auto Tab Discard). I This many tabs causes every tab management extension I've tried to be unusably slow. Even the Firefox multi account containers popup usually takes around 2 full seconds to load, presumably because it's counting the number of tabs for each container (a feature I would happily disable if possible) via a horrendously slow API.