flashplayer fullscreen doesn't work properly after last flashplayer plugin update

[Adam]

I suppose that is something wrong with last flashplayer update because since I've updated this plugin fullscreen had started sometimes to blink during watching video streaming services (like yt or vimeo), something like disappearing for a split seconds because during blinking I see fragments and shapes of my desktop wallpaper. It happens not only in HD but even in very low resolutions like 240p or 480p.
Mint 17.3 Cinnamon

[Adam (adczerski)]

this problem is only in firefox (so maybe it's not flashplayer but browser's problem). I've installed chromium and its work well. After reinstall firefox this problem still exist in this browser.