I have two issues I think are related.
sometimes Firefox freeze on one tab when I click on a Firefox/thunderbird link or sometimes when I look a a youtube video, it is random. When it freeze I can click on another tab and have the correct title for it but the conten stay frozen on the same tab.
Sometimes it does not freeze but the web content shakes itself and stop shaking when I open a new tab.
I have tried safe mode : same issue. I have created a new profile : same issue.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions and some Preferences.
To Reset Firefox do the following:
For Firefox versions previous to 29.0:
For Firefox 29.0 and above:
Further information can be found in the Refresh Firefox - reset add-ons and settings article.
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this happened to me a few minuites ago, i thought it was just general lagg of my computer but then i checked my internet connection, tried loading google and it was so slow. rebooted my computer and still nothing. But then, i reload internet and everything is fine... long story short i think its down to internet connectivity.
What content is there on the Bookmarks Toolbar?
Is there anything other than "Bookmarks Toolbar items" if you check the in Customize mode?
Are there any other toolbars present in Firefox?
You can check for problems caused by a corrupted localstore.rdf file.