Created attachment 816159 [details] screencast4.gif I am running Nightly 27.0.1 from 2013-10-11. Here is what I did I set a breakpoint. This breakpoint gets hit 3x in a row at app initialization. It is triggered a 4th time by a user interaction. However, this time the whole FF UI becomes unresponsive. I can not do/click anything in dev tools nor in the FF user interface. (Keyboard shortcut to open an new tab still work) Changing to a new tab or any program (hence taking away the focus from this tab) and it will become responsive again and continue normally. I show this to :fitzgen and he didn't know what causes this either. We were able to rule out addons/exentensions. I attached a screencast of it becoming unresponsive, although I admit this may not make to much sense. ;-)
Just a note, this is a focus issue, not a beachball issue.
Can you give solid STR with a specific app or something?
Closing down, feel free to re-open with solid STR as mentioned in comment 2.
Status: NEW → RESOLVED
Last Resolved: 4 years ago
Resolution: --- → INCOMPLETE
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