Tab and Enter key events lost

[John J Barton]

For a long time some Firebug users have complained that after using
Firefox+Firebug for a while their Tab and Enter keys quit working. As in
they can't use these keys to eg navigate in web pages.

Here are some of the things we've figured out:
* It doesn't happen right away, or to everyone.
* If you get burnt, you have to open a new window and use it instead.
* Or you can restart Firefox
* No exceptions in the Error Console
* If all key events are monitored, Enter and Tab events are not sent.

Specifically on the last point, in the same window and control that
showed Enter and Tab events before the keys fail, later do not have
Enter and Tab events after these keys fail.

Obviously this is very frustrating to users who get hit, but that does
not include anyone who is working on Firebug.

Any ideas? If the enter and tab events are not arriving in an listener
what can we conclude? That they are not being sent by Firefox? or that
they may be trapped by another listener? If the latter is there someway
to detect this?

Thanks,
John.