Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

My vertical scrollbar sometimes resizes my window, and I have to exit out of Firefox when this happens. Why?

  • 1 reply
  • 1 has this problem
  • 2 views
  • Last reply by kobe

more options

Sometimes, when I try to move my vertical scrollbar up or down, the entire window will shrink or expand, and the only way to make this go away is for me to exit out of Firefox and then re-open Firefox. It seems to happen randomly, and often happens several times a day.

Sometimes, when I try to move my vertical scrollbar up or down, the entire window will shrink or expand, and the only way to make this go away is for me to exit out of Firefox and then re-open Firefox. It seems to happen randomly, and often happens several times a day.

All Replies (1)

more options

Hello,

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.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you.