I have been using Firefox for 3 years now and I don't know why it is suddenly giving this problem. Firstly, it takes a few minutes just to open and when it does any attempts to click on anything are unresponsive. Usually it stays completely blank, sometimes opening to the Firefox Start page, but always unresponsive. Sometimes I get a message saying that the bookmarks and history are not available because one of FIrefox's files are being used by another program. I have switched to Chrome and it works as normal. I have tried opening in FIrefox's safe mode, in Window's safe mode and reinstalling Firefox, but none of these helped. Please remember that I cannot click on anything in Firefox, so the solution will have to be from outside the program.