I have a new problem that just appeared. Specs: MAC OS, Adobe Flash Player, Firefox browser, all up-to-date. Sudddenly, when using sites that have streaming video the stream presentation is extremely zoomed-in. This problem only manifests when using Firefox, Chrome is ok. I saw suggestions to deactivate hardware acceleration but when I right click on the image I cannot uncheck the "enable hardware acceleration" box because of the zoom issue. I'm not even sure if this is the right fix for the problem. This is something new for me and I've been fighting it all day. Appreciate any help that can be offered.
It's unlikely Flash Player is involved in playing your video today. A few years ago it was used for Youtube and Facebook, but they gave it up. If it IS Flash Player you have a problem as it will close down in 3 months - or sooner (for many Mac users it closed down this week).
I'm having the exact same problem playing games that use flash player. It started when I ran the latest OS update, so I don't know if it's an Adobe issue, an Apple issue, a Firefox issue, or just the combination. In any case, I wanted you to know you're not alone. I just don't know how to fix it.