Actually, it's working after restarting browsers
I never restart browser after enable this option, always try without browser restart, then disable this future because "not working". You should add some restart note
in settings, near to this option.
Anyway, this option is keylogger protection? Confirmation pop-up appear if keylogger try to grab password from the clipboard?
Btw, this option is in conflict with all win applications which one using clipboard. Like translators, firefox plugins, etc... If try to insert BB code or email addresses, from the Firefox macros (right click), confirmation password popup always appear? If try to open translator (he using clipboard), popup appear & I can't get rid of him? I must kill translator from the processes. Etc...
P. S. How to disable this small pop-up