I'm having a very annoying problem: I'm using Firefox 4 Portable on my office PC, everything is ok except when clicking links from my email programm or messenger. Firefox (already running) won't open them but instead displays an error message:
Firefox is already running, but is not responding.
I think the problem is that I previously used the normal version of Firefox on that machine, which i removed - and the system won't recognize the portable version properly.
Any ideas how to fix this?