I had it once. Not sure if it's a virus or just malware (from the videos). Malwarebytes and Spybot S&D both picked it up and got rid of it. The only safe videos are (MOST of the time) the ones on the carousel page (and, while they last, the 8credits x 5 vids). Anything else is a risk. One of the sponsors/videos puts the PremiumSearch trojan in your computer (it's a redirect fake google search that you have no idea you're using. It looks, says and acts like Google. I get it sometimes, but MBAM and Spybot S&D get it out. I use IceDragon, too, and have it set to "never remember history" so no cookies are ever kept. I also have Flash set to not allow any sites on the web storage section. One more thing about flash, go to control panel, find it, and rt. click and click "create shortcut", and you can completely empty everything in it during or after play. Just click the delete ALL, and click advanced, and delete ALL again. It has ZERO affect on your game. I never have meter issues, or flash issues. CCleaner and Advanced System Care are the best cleaners (the ASC paid version can't be beat by any cleaner out there, and it's pretty cheap, plus you get 3 (for 3 separate computers for the price of one).
When I get any malware, spyware, virus, or trojan, I send the log file to the program company that found it, and they can tell you where it came from, and add it to an immunization list. Hope this helps.