Tab Mix Plus was marked in your Extensions page for last 6mos or more as Legacy with yellow box and black lettering and info. Tab Mix Plus could not make the changes to the new code that 57 runs on. It is not supported nor will the Developer be making new for Firefox unless it is in the future. Same for others you maybe missing. They maybe still coding. You can Track them here for progress : http://bit.ly/2j0Anlj Going back : unfortunately 56.0.2 is no longer safe to use for every day use, but 52.5.0 ESR is! It will continue to get security updates until May 2018, and you can download and install it from this page: https://www.mozilla.org/en-US/firefox/organizations/all/ Note : Legacy Extensions will be deleted or removed in any version update after May 2018. You should make a backup of your Profile before going back and just because: https://support.mozilla.org/en-US/kb/back-and-restore- See if you can find updates for your Intel(R) HD Graphics 4000 as they are A little old : driverDate: 12-21-2015 You can Google Intel(R) HD Graphics 4000 and find the download page https://downloadcenter.intel.com/product/81499/Intel-HD-Graphics-4000, but you may have to know what generation chipset you are using. GPU-Z would tell you this https://www.techpowerup.com/gpuz/ Can also try : https://www.intel.com/content/www/us/en/support/detect.html I do not see any errors in the drivers. Old & corrupted Drivers cause a wide range of issues. Please keep them updated to prevent issues and you never know when Intel will stop supporting them. Please remove as is a security risk Shockwave Flash 21.0 r0 Flash Player Version: 27.0.0.187 Current Version https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only> Please let us know if this solved your issue or if need further assistance.