Urm - eek... I made this change (#579) about 3 months ago but have not gotten around to publishing it until today...
The idea is that if you release the modifier key, it should release the layer's button and repress the button on the layer that was switched back to... But it sounds like there are some unintended side effects...
Certainly, it should not trigger any buttons when you simply press CTRL - thats odd.
Ive no idea what you mean by "Also, the frequency with which the LEFT or RIGHT button is kept depressed during FIREFOX running (even still backgrounded) is increasing, in this beta.
" Have you remapped the left or right buttons? If not, there should be no impact... Its worth looking in the log file (with debug logging turned off) maybe I left some hard coded debug messages in there which could be delaying things - not something Ive noticed myself over the past few months though... so Im not sure.
As for the translation - yes, looks like I may have got that wrong - I'll check - and "Numeric keyoad tags" should be "Numeric keyboard tags" - again probably a screw up when I split the text up.. Will check and sort that (at least they are easy, even if I should have caught them before releasing it!)
The good news is that I hope the next beta will be available a little quicker (although the main issue may take some time to diagnose, I hope its not several months!)