Hi ahupito, That can cause issues and Adobe have a utility to sort out the uninstalling. Probably of a lot more concern is that you are apparently on an unsupported unsafe version of Firefox and should update that immediately. * [[Update Firefox to the latest version]] * https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html ** https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html#main_Download_the_Adobe_Flash_Player_uninstaller It is probably worth noting a lot of sites now no longer need FlashPlayer. For instance YouTube now provides HTML5 video by default. Checkout this test page once you have updated Firefox * https://www.youtube.com/html5 Consider setting FlashPlayer to always ask * [[Set Adobe Flash to "click to play" on Firefox]]