Please give this a try : https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

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, . . . .) Note: Other software is offered in the download. <Windows Only>

Just in case:

Please use more than 1 scanner as each uses diff tech : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Save your Report and google each before deleting anything as do not want to delete something you need, If need help : https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/ Post in only 1 forum, then wait.

Please let us know if this solved your issue or if need further assistance.

Re-installing flash did nothing. The whiteout remains. I have checked for malware as well. It ONLY happens on Firefox and ONLY with flash content. Last time i couldn't add an image for some reason but here it is here. That site has it happening most prominent. But it happens with everything Flash that is loaded in an inactive tab.

The same happens on another windows 10 machine in the family as well. Still ONLY firefox and ONLY flash and ONLY if it loads in an inactive tab.

Why would Flash be loading in an Inactive tab ? And I see nothing wrong with the left pic and the right is the standard adobe settings. Untick Hardware Acceleration.

You make no comment if ran the anti-malware programs as this is sorta suspicious. But at the same time this does not seem to be a Firefox issue. Please search for info from Adobe or from their forum which is the link below.

From 2009 https://forums.adobe.com/thread/480280

Because I need to open several tabs to make voting for my friends on that flash site faster, or let a flash game load on another tab while I do something else better then waiting for a game to load. And you don't see whats wrong? on the standard settings page you see what the first pic looks like when it's properly loaded. The first pic is what i see flash content in when i have opened a new tab with it and not went strait to it. The only way for it to load fully is to open the settings or refresh the page. Hardware acceleration doesn't change it either.

Did you even read what I said? If I do the same thing on IE, Edge, or Chrome I don't have the "whiteness" happening. it ONLY happens on Firefox. ONLY with the flash content. And ONLY if it was on an inactive (not the tab I am currently in) tab.

And yes I don't see why I should use a malware searching program for this as I said it happens on other computers in my household as well. Unless we somehow all miraculously got the same malware. I have provided the steps for recreating the problem SEVERAL times. Why not try it for yourself and see may be you have the same "malware" I do.

P.S. I have tried to do it on firefox with add-ons disabled and it STILL happens. So it's not an add-on issue either.