Hi, one or more of your add-on may be interfering, so '''Try Firefox Safe Mode''' to see if the problem goes away. [[Troubleshoot Firefox issues using Safe Mode|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 [[Image:New Fx Menu]], click Help [[Image:Help-29]] 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'' <br>(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". ;[[Image:SafeMode-Fx35]] '''''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.'' -------------- Incidentally, you have more than one version of Shockwave Flash - which can cause problems, so all but the latest should be removed from your machine - * [https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player.] * [https://get.adobe.com/flashplayer/otherversions/ Install Flash Player] - take care to deselect any optional offers! When you figure out what's causing your issues, please let us know. It might help others with the same problem. Thank you!

This was very helpful. I was able to locate the add-on causing the issue. Tab Utilities 1.5.28.1.1-signed.1-signed Is there a suggestion what I can use in place of this?

Hi, this is the most comprehensive https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus/ Also for specific functions see https://addons.mozilla.org/en-US/firefox/addon/open-bookmarks-in-new-tab/ And https://addons.mozilla.org/en-US/firefox/addon/open-link-in-new-tab/ And https://addons.mozilla.org/en-US/firefox/addon/dblclicker/