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Re:Choose Firefox Now, Or Later You Won't Get A Choice (2014) by agumonkey on Friday January 06, 2017 @06:36AM (#13335541)
Let's see if that improves things.

ps: refresh done, still lagging on tab open/close. That said, I use Nightly, and I'm not sure it's not instrumented and thus slower..

Re:Choose Firefox Now, Or Later You Won't Get A Choice (2014) by nachtigall on Friday January 06, 2017 @07:58AM (#13335903)
I do not think that Nightly should be any slower than say Dev Edition (Aurora) or the stable release. What's your default page when opening a new tab? Maybe it's because your start page needs long to load?! Mine is "about:home" (set with https://addons.mozilla.org/en-US/firefox/addon/new-tab-overr...)
Re:Choose Firefox Now, Or Later You Won't Get A Choice (2014) by snovv_crash on Friday January 06, 2017 @09:34AM (#13336429)
If you have LastPass, make sure you updated to plugin 4.x. Earlier versions didn't play nicely with the new multithreading, causing big lags.