Try safe mode Diagnose Firefox issues using Troubleshoot Mode

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

Please report back soon.

Thank you Waka_Flocka_Flame and ComputerWhiz!

First of all, my FFox is default config, and doesn't have any plugins. I tried it in the safe mode, but the issue still persists. Would you click the link and try it?

As I mentioned, It doesn't happen with Chrome nor Safari.

Please advise! Honomatsu