This is more of a browser specific problem, so please excuse me if this is the wrong place to post it. I've the latest version of Firefox installed on my system (27.0.1). But something seems to have gone wrong with my Firefox browser. It was working fine 15-20 days back. But now the browse button just doesn't seem to work. I don't get the dialog box at all. And it's the same case in all sites and not just one particular site. It seems to be a problem with dialog boxes only as when I right click on any picture and click "Save picture as" or "Save target as", nothing pops up. Screencast added to better express what I'm trying to say. (sorry for the very low audio, you may need to crank up the volume on your system) I also tried un-installing the current version, then downloading a fresh copy of FF and installing it making sure no previous settings are imported. But the problem still existed in a freshly installed browser. PS: If I boot in Windows safe mode, the button starts working. This makes me believe that some windows driver is interfering with Firefox, but is there a way to find out which driver?