Hello lascetic

check it in Safe Mode, select "Start in Safe Mode" and see if this happen again, if not see: Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

thank you

Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

@ideato Unfortunately it's difficult to reproduce it because it happens kind of randomly, or I haven't figured out the pattern yet. So it would be hard to test it in safe mode. Thank you.

You can check for problems with the places.sqlite database file in the Firefox Profile Folder.

• http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
• https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

@cor-el. I have tried the Places Maintenance Add-on but didn't help. At the moment and as the issue is not very frequent, I prefer not to delete my history, so I haven't gone into removing the places.sqlite file. If other users have noticed a similar issue it may be a bug with the newer ff versions rather than a corrupted places.sqlite. Thank you.

I have the same problem on Windows 8. When page is loaded firefox and all opened applications are minimizing.