how to turn on hardware aceleration

been having problems past week or so with waterfox and plugin container with forge of empires for a bout past 2 weeks everytime i have gone on forge of empires the pligin container takes up about 7 gig of ram slows my computer down then Firefox crashes if i log of forge of empires it drops straight back down i tried stooping it in resource manager and flash crashes so i came here thinking it must be from flash update . why reading helpful topics it said to uptick hardware acceleration by loading page were flash is active right click select settings and untick box hardware acceleration  and test which i done made no difference so went back to tick box and it wont let me cannot even get rid of the box have to refresh page after googleing it i found out it was to use my grafix card ive uninstalled waterfox and reinstalled same with flash useing flash unistaller and also uninstalled grafix driver useing amd uninstaller reinstalled latest drivers for amd still the same could somebody help me ime a big player in forge of empires and this is spoiling it for me the graphics on screen are bad since unticking box and plugin containert is taking all my ,emory

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