I've had problems with Firefox being sluggish to the point of stop responding to scroll events for ~1 second when loading tabs in the background, like when open

I've had problems with Firefox being sluggish to the point of stop responding to scroll events for ~1 second when loading tabs in the background, like when opening a Reddit thread in a new tab and then scrolling down on the front page. This seems to be fixed in 44 (current developer edition) if you enable three options in about:config: browser.tabs.remote.autostart [0] layers.async-pan-zoom.enabled [1] layers.offmainthreadcomposition.testing.enabled [2] I didn't test this on previous versions, so they might work in those as well. [0] https://wiki.mozilla.org/Electrolysis https://wiki.mozilla.org/Electrolysis [1] https://wiki.mozilla.org/QA/Async_Scrolling_in_e10s https://wiki.mozilla.org/QA/Async_Scrolling_in_e10s [2] https://mozillagfx.wordpress.com/2015/05/19/off-main-thread-compositing-on-linux/ https://mozillagfx.wordpress.com/2015/05/19/off-main-thread-...