3 ms·

I don't save tabs and have about 10 addons. I'll try to see if any of them are the cause. Edit: I should note that Firefox is only slow on the first opening af

I don't save tabs and have about 10 addons. I'll try to see if any of them are the cause. Edit: I should note that Firefox is only slow on the first opening after a cold boot. Firefox is fine after that. Might be some caching issue. Edit 2: After a cold boot, Firefox loads quickly in safe mode. Disabling ABP did not seem to eliminate the problem. Disable NoScript seemed to help a bit. I might switch to uMatrix instead of those two and see if that helps.

NemosDemos 7y ago
If you do manage to find a solution, I'd love for you to share - I have this exact same issue. For reference, re-installing FF doesn't seem to fix it, and I have neither NoScript nor uMatrix installed (although do have uBlock Origin). (I've been meaning to troubleshoot it for a while, and if I manage to track down the issue, will let you know).
- temp123123123 7y ago
  While my experience is on Windows, and with Chrome, I have also had a similar issue. I ended up tracking it down to the fact that on start-up, over time a lot of junk got added into the applications/services that run on start-up. To the point that it would slow down Chrome when I tried to open it right away. So a potential solution to your problem is to check out what else is running at start-up that might cause FF to run slow, but only at start-up.