Ever since what I think was either a Firefox upgrade (I don't know which one) or installation of Quicktime, my Adobe Flash Plugin is perpetually crashed and I cannot play any Flash content on any website. All that displays in place of the video is a gray screen with the sad-face Lego icon and the message: “The Adobe Flash Plugin has crashed. Please reload the page to try again.” (See attached image.) But it will not resolve when reloaded. No Flash videos on any sites work. HTML5 videos work on YouTube when tested, but non-HTML5 videos won't work. Also, my Javascript does not seem to be working since at least some displays requiring javascript don't work. Sometimes the display just doesn't work, and sometimes I get a message that javascript is disabled and must be enabled, but it is already enabled (set to “true” in about:config). I have spent days scouring every help forum entry I can find on troubleshooting Flash Player and Javascript. Everything on my end seems to be in order and I cannot find or fix either problem. I think it is possible the issue could have its roots in the fact that Javascript seems to not be working which may be preventing Flash Player content from working...?? Also, Flash content does work in I.E. but not in Firefox (I do not have Chrome installed so did not test in Chrome). I have too many window tabs open in Firefox and can't switch to I.E. (nor do I like to use I.E.). PLEASE HELP as this is crippling for very important work deadlines I have. This is what else I know and have tried: I have a Toshiba Satellite C75D-A Laptop; Processor: AMD A6-5200 APU with Radeon HD Graphics; x64; 2.00 Ghz; RAM: 8 MB; OS: 64-bit system; Windows 8.1 (but some auto-check utilities detect it as 8.0 because it was upgraded.); Graphics Card: “Desktop Graphics” System – AMD Radeon HD 8400 (0x9830); Installed Graphics Driver Version: AMD 13.352.1004.1007 (Driver Date: 4/22/2014) My Device Manager graphics driver updater states: “driver software is up to date.” From the AMD website: the graphics driver auto-detect utility recommended the AMD Catalyst Driver (amd-catalyst-omega-14.12-without-dotnet45-win8.1-64bit.exe) I tried installing this driver, but it won't install. After trying to install, I got a message stating: “We are unable to find a driver for your system.” But Device Manager states I have a current driver, and my graphics card & driver seem to be working fine, so I do not believe this is part of the issue. I am using Latest Firefox version 35.0.1; and Using Latest Flash Player: 32-bit NPAPI Plug-in Version: 16.0.0.296; designated: “always activate” (Downloaded new update several times, including fresh install after uninstall; system & web address icons indicate Flash is enabled). I turned off hardware acceleration in FF Tools>Options>Advanced>General I disabled WebGL as explained here: https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration I am using Ad-Block Plus which has never affected things in the past. I have not tried starting FF in Safe Mode because I believe I will lose all open tabs and not be able to recover them (I may have over 200 open). But disabling add-ons has no effect (I disabled all except for Sessions Manager in case of a crash). (My No-Script has been disabled for at least six months.) I have Windows Media Player and Quicktime installed. Quicktime is most recent upgrade (7.7.6) so should not be a problem according to: “QuickTime plugin takes over Flash” at: http://kb.mozillazine.org/Flash#Disabling_Protected_Mode_in_Flash_11.3 (note underscores in place of spaces in string; underscores not insertable here) Disabling Quicktime had no effect in the prior version of FF (ver. 35.0), but in latest FF ver. 35.0.1, Flash videos only display a plain (blank) gray screen instead of the sad-faced icon and crash message. (I tried to uninstall Quicktime altogether, but was not able to due to Error codes 2502 & 2503. I tried troubleshooting that as well with no luck using methods successful for other programs, including here: http://www.fixkb.com/2014/01/error-2503-and-2502-when-uninstalling-on-windows-8.html; & here: http://answers.microsoft.com/en-us/windows/forum/windows_8-winapps/re-internal-error-codes-2502-and-2503-for/ba5f2145-aa6e-4cc0-81a7-e4346f43b698.) Disabling my FF theme and using the default brought back the sad-faced icon and crash message in the place of videos on some YouTube pages, but not other YouTube pages (where video was still blank gray screen). It also enabled a still Flash image (an ad) to display on a different website page that previously had a Flash Plugin crash message. I have been using this same theme for a couple of years without previous issue. While turning it off did generate an effect on some still imagery, it didn't fix the video problem. I tried Disabling Protected Mode in Flash 11.3 as explained here: http://kb.mozillazine.org/Flash#Disabling_Protected_Mode_in_Flash_11.3 (note underscores in place of spaces in string; underscores not insertable here). It did not solve the issue. I also deleted all storage & data in Flash Player as advised. This had no effect either. I've tried all solutions I've been able to find and am at a loss for what to try next. Please help and advise ASAP. Thank you!!