Since Firefox v34, Cyberfox v34 and v34.0.5 will not play embedded flash on W7 SP1 PC (and W8, 8.1). It has been reported by a few folks to Troy Smith (Cyberfox developer) but it's not universal and he can't duplicate the issue. I have both the most recent versions of Adobe Flash and Sandboxie. There isn't a problem using Firefox, the x64 Nightly or IE 11. If anyone would know how to configure/force Sandboxie to play the flash in Cyberfox I would appreciate it! I see there is a thread about this on the Sandboxie forum. I will monitor it too.