This might be quite important and relevant. I've written a short tutorial showing how to troubleshoot, isolate and work around the issue of slowness in Firefox 65 on close, resulting in high CPU usage for extended period of time, including step-by-step component search, 32-bit vs 64-bit options, safe mode and EMET mitigations, the use of previous version and ESR build, accessibility services, and more. https://www.dedoimedo.com/computers/firefox-65-slow-close.html Cheers, Mrk
I've seen a lot of complaints of issues with 65. I can't duplicate any of them. I don't doubt any of them, but they do not seem to affect everyone.
FYI. I'm not seeing the issue with my Firefox 65 64-bit browser either. Running only 3 add-ons: AdBlock Plus, HTTPS Everywhere and NoScript. Browser shuts down immediately, and all instances of firefox.exe are quickly released as well.
I did my own testing and you can read it here for free without having to click a link with ads on the page: If you enable EAF protection in Exploit Guard, Firefox will slow down. This also applies to Firefox 64, and 63. Nothing unique to 65. Simple solution, don't enable EAF. Other mitigations work fine, including IAF. But you know, people gotta make money off nothing.
To me, excluding the AV bug, Firefox 65 is one of the best and fastest releases of Firefox made to date on both Windows and Android. I've not seen these serious issues people are talking about.
I've always waited on the XX.0.1 releases but went with this 65.0 to see what all the excitement was about. None at all. I agree with Firecat... "Firefox 65 is one of the best and fastest releases of Firefox made to date..."
I didn't encounter any problems with slow shutdown after upgrading to 65. I did have similar problem with previous versions and solved it by disabling multiprocessing in FF.
I've never had such problems with FF on Linux and on Windows. They might be related to 3rd-party AVs, indeed.
For me although I close the browser but Task Manager shows FF still running Unless I set to 'Never remember history' (i.e. in private browsing mode) then the problem goes away Using FF 65.0. No issue with 64.x
No problem on Linux indeed, but it's a different architecture, which is why I emphasized the Windows side of things. @summerheat, the slowness is not related to AV at all, because I don't use AV. Mrk
Yes, Fx 65 is really good for me. One day I might even figure out why I have a South African language pack. lol
Just to emphasize, no issue on Linux this is entirely Windows-architecure related. And it's something that didn't happen in 64 and does in 65. Very specific. Mrk
Count me as one of the people having issues with 65.0, thought it's not a speed issue like OP but a graphical one, had to go back to 64.0.2 where there are no issues, so it's clearly a regression with 65. Even made an effort post about it here so hopeful someone will have some ideas.