@Carm01: see this bug report for firefox on bugzilla here: 1271398 – [Regression] Problems with Adobe Flash Player 22 Stage3D and Firefox x64 >=v48 The bug happened with firefox (64 bit only) version 47, and is supposed to be fixed with version 49, which is scheduled for Tuesday this week according to one of the latest comments to this bug report. Note: Many applications seem to be unaffected by this bug, but there are quite a few applications (like browsergames) which are not usable with FF 64 versions 47 and 48 bit due to this bug; see the comments to the bug report. ... View more

Careful with Firefox 64 bit: The adobe plugin will not work properly from Firefox x64 versions 45(?) up to 48 (current version) - many Flash games (including Forge of Empires and Elvenar) crash with these versions while loading. Firefox x64, version 49, where the adobe plugin should work, is sheduled for thuesday (20th september) as far as I know, so maybe wait a few days before trying Firefox 64 bit. ... View more