Today the firefox debugger suddenly stopped working. I have the latest version of FF and have not upgraded. I did not add any extensions that may have caused the break.
When I launch the debugger, the watch expression pane is closed. Previously, when it was working it would launch with this pane open.
If I set a breakpoint, it is ignored. If I add a watch expression, they are not added to the variable display. Previously, this would be populated with all of the global script variables initially.
I have tried rebooting, restarting, clearing the cache, installing a fresh copy and creating a new profile. Nothing has worked, and I don't know how to provide a test case because it happened spontaneously.