If your Firefox window shakes, bounces, or jumps up and down erratically, you ​can ​try ​the ​foll​owin​g acti​ons ​to addr​ess ​the ​problem. __TOC__ = Check extensions and themes = * If you recently switched to a new theme, switch back to the default one - see [[Using themes with Firefox|#How to switch themes]]. * If one of your extensions or themes recently updated, try disabling it to see if it is the cause. For instructions, see [[Troubleshooting extensions and themes]]. = Check toolbars = *If your Bookmarks Toolbar is showing but it does not contain any bookmarks, either add a bookmark to it or hide the Bookmarks Toolbar. See [[Bookmarks Toolbar]] for more information. *To reset all toolbars and controls to the default settings, follow the instructions to [[Firefox window is too large or opens off screen|Reset Firefox toolbars and controls]]. <!-- MZ cred​it --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Window_shakes Window shakes (mozillaZine KB)]'''''

If your Firefox window shakes, bounces, or jumps up and down erratically, you ​can ​try ​the ​foll​owin​g acti​ons ​to addr​ess ​the ​problem.

Check extensions and themes

• If you recently switched to a new theme, switch back to the default one - see #How to switch themes.
• If one of your extensions or themes recently updated, try disabling it to see if it is the cause. For instructions, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

Check toolbars

• If your Bookmarks Toolbar is showing but it does not contain any bookmarks, either add a bookmark to it or hide the Bookmarks Toolbar. See Bookmarks Toolbar - Display your favorite websites at the top of the Firefox window for more information.
• To reset all toolbars and controls to the default settings, follow the instructions to Reset Firefox toolbars and controls.

Based on information from Window shakes (mozillaZine KB)