Good afternoon. With the newest update of Firefox for PC (31.0), I have a problem that occurs almost every time I use the browser. When trying to close a tab, it sometimes cause the browser to freeze during one minute. Then a dialog-box appears on the screen. It says that the script "chrome://browser/content/tabbrowser.xml:2004" may be busy. I can choose between two buttons in this dialog-box. "Continue" which keeps the script running, in theory; though it just closes the dialog-box, makes the browser freeze again, and then the same dialog-box shows up. "Stop the script" which ends the freeze; but then I'm unable to close tabs (I can still close the browser). I also noticed that, when the freeze occurs, the content of the tab I tried to close changes to "New Tab". When I restart the browser, I am able to close tab again, until the freeze shows up again. The problem started to appear only when I updated Firefox to the 31.0 version (and I didn't add any browser extension in the meanwhile). Does anyone have an idea of what I could do to avoid the problem? Thank you very much and have a good day!