Can't open new tab via middle-clicking link, + button, or ctrl-T; on restart, FF opens that many new, blank tabs
Firefox 43.0.4 Windows 10 Pro
Can't open new tab via middle-clicking link, + button, or ctrl-T After restarting Firefox, FF opens a number of new, blank tabs equal to the number I tried to open prior to restart. I am able to open new windows and new private windows and am able to open new tabs in these new windows.
Modified by magnuspraeda
All Replies (3)
Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:
- Click the menu button
, click Help 
and select Restart with Add-ons Disabled.
If Firefox is not running, you can start Firefox in Safe Mode as follows:
- On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
- On Mac: Hold the option key while starting Firefox.
- On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
When the Firefox Safe Mode window appears, select "Start in Safe Mode".
If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.
To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.
Try to move the tabs to a new window and close the not working window to see if that works after a restart.
The bug is intermittent and I've only experienced it twice. I will try to replicate it again in safe mode.