User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:46.0) Gecko/20100101 Firefox/46.0 Build ID: 20160502172042 Steps to reproduce: It seems to randomly occur, but I am mostly working in Wordpress admin panels and developing my own websites which use jQuery. With a fresh start of Firefox, the freezing isn't there. But after a while it comes back. Closing tabs does not help. Actual results: Firefox works normally, but every x seconds, the UI will hang for a second, causing interruptions in scrolling, in text typing, in right click menus, .. in short: the entire UI hangs for a second. Expected results: UI should run smoothly, bit like butter
Sander, to narrow down the problem, could you please try the following? 1) Test in a clean profile https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles 2) Test in Safe Mode https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode 3) Disable hardware acceleration https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems#w_turn-off-hardware-acceleration 4) Try to get a stack trace from hung Firefox on Windows https://developer.mozilla.org/en-US/docs/How_to_Report_a_Hung_Firefox Please post back the results.
Quite strangely, while having suffered from it for the better part of 6 months, I haven't experienced this issue since I did a few things. First was to disable hardware acceleration as I was getting black artefacts. A second was to scale down my Win10 UI scaling from 150% (recommended) to 125%. Now I don't have time to test all various configurations, but if the bug shows up again later despite these new conditions, I will post here.
Based on the previous comment I'm setting this as Worksforme. Sanger, please don't hesitate to reopen it if the issue is back and reproducible.
It is back and -for me- reproducible. It always happens when having (several tabs with) Wordpress' Admin page open. After a bit of changing settings and content, the FF ui will start to lag. Closing these tabs will not help: the UI continues to lag and stutter until the browser is restarted.
Also goes for having the Squarespace editor open. After a while it will start freezing intermittently
Sander, since the issue is back and reproducible, the information required in Comment 1 is still valuable and necessary if we want to track down the cause of this issue. Could you please test the other configurations and post here the results?
(In reply to Simona B [:simonab](PTO) from comment #6) > Sander, since the issue is back and reproducible, the information required > in Comment 1 is still valuable and necessary if we want to track down the > cause of this issue. > > Could you please test the other configurations and post here the results?
Sander, are you still experiencing this issue? Any updates? (Please see Comment 6)
I am experiencing lots of short hitches in Nightly (51.0a1 (2016-08-16)). I've tried a fresh profile as well as safe mode and disabling hw accel, no luck there. Running under Windows 10 Pro / 10586. I can go into about:memory and run garbage collection which resolves the issue for a short time, but some pages (heavy jquery usage) will trigger the issue again.
(In reply to Sander Van de Moortel from comment #11) > Ok this is starting to drive me insane, yet I don't quite want to give up on > Firefox yet. What exactly do I need to do to report this kind of behaviour? > Will using "analyse" on the Gecko Profiler work? https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem
OK here's a log from when Facebook rendered the entire browser unresponsive with a script. I think that's what it is, because I have no idea of how to use the profiler. https://cleopatra.io/#report=235ca8a5ffd5f6a53b6976a75442482bc3f606fd This isn't exactly what I meant by short UI freezes, as these essentially are pretty long (several seconds). But they may be related/similar?
I'm having UI Freezes on Windows 10 as well sometimes apparentely random but often when Laptop was in standby/energy saving/hibernate.
As of a few days ago, Nightly no longer shows symptoms for me, so my issue is resolved. There may be other problems with heavy sites still, but the intermittent hitching regardless of windows open is resolved.
Olli, could you please take a look on the Cleopatra profile from comment 13? Is there anything useful? Should Sander try to catch a new one?
(In reply to Olli Pettay [:smaug] from comment #17) > Sander, tons of time is spent in and under "Perapera Chinese". That seems to > be some addon. Indeed https://addons.mozilla.org/en-US/firefox/addon/perapera-kun-chinese-popup-tra/ Something wrong with it.