[trevor-e]

macOS High Sierra. I generally have a lot of tabs open: two Inbox tabs, Facebook, StackOverflow chat + question pages for what I'm working on, many JIRA tickets, HN, sometimes Twitch, etc.

I think it has something to do with video rendering since opening Twitch/Youtube often causes the problems to start.

[jdeibele]

Try https://addons.mozilla.org/ca/firefox/addon/auto-tab-discard... I had been using Tab Suspender from the same author but recently noticed that it was deprecated for FF 57 or newer.

Pretty happy with it on long-running tabs I check once or twice a day.