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Firefox lags after locking OS

  • 2 replies
  • 0 have this problem
  • 23 views
  • Last reply by 1majom

1majom
1majom
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If I lock my machine for more than a few minutes and then log on again, it's always the same. I unlock my system and feel some kind of slowness in Firefox. When I switch from the currently open tab in Firefox, the new tab is highlighted in the tab bar, but the content part of the window is frozen. If I quickly open htop, I can see that the main Firefox process is suddenly using about 130% of my CPU. The only solution I have found is to quickly open htop after unlocking the system, send a SIGKILL to the main Firefox process and reopen it. This way the freezing, slowing problem is nowhere to be seen.

I am running Debian 12 with Firefox 115.4.0esr (64-bit). I have more than enough RAM and CPU.

If I lock my machine for more than a few minutes and then log on again, it's always the same. I unlock my system and feel some kind of slowness in Firefox. When I switch from the currently open tab in Firefox, the new tab is highlighted in the tab bar, but the content part of the window is frozen. If I quickly open htop, I can see that the main Firefox process is suddenly using about 130% of my CPU. The only solution I have found is to quickly open htop after unlocking the system, send a SIGKILL to the main Firefox process and reopen it. This way the freezing, slowing problem is nowhere to be seen. I am running Debian 12 with Firefox 115.4.0esr (64-bit). I have more than enough RAM and CPU.

All Replies (2)

zeroknight
zeroknight
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1majom said
the content part of the window is frozen.

If the content updates when you switch to a different window (eg Alt+Tab), you may be able to rescue it by going to about:support and clicking the button next to "Device Reset" (may appear as "gpu-device-reset").

You might be able to avoid it by disabling hardware acceleration and/or running in native Wayland by setting the environment variable MOZ_ENABLE_WAYLAND=1.

1majom
1majom Question owner
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zeroknight said
If the content updates when you switch to a different window (eg Alt+Tab), ...

Sadly switching to an other window never helped. But I will try disabling hardware acceleration and will reply.