Comment 175 for bug 230102

(In reply to Dr George Collins from comment #167)
> With a brand new user profile, Firefox 12.0 behaves correctly and as wished
> by warning me before trying to close multiple tabs!

So Firefox with a clean profile behaves correctly and no longer exhibits bug 419009 (as it is currently described). But I suspect it still exhibits bug 702478, which is the same as 419009 except it ONLY manifest when you do File > Exit (which in Linux is File > Quit or keyboard shortcut Ctrl-Q). Could you try opeing a few tabs and then doing File > Exit. I suspect you will NOT get the warning. (My bug 702478, comment 1 gives more info.)

> However, one of the reasons I run Firefox is the useful extensions (such as
> case changer and FireFTP) that are available for it.
>
> Is there an easy way that I can list all the bolded "user set" changes I
> have made in my profile (and presumably visible at "about:config") so that
> we can narrow down the problem?

Not that I know of, but I am not an expert. It might be worth installing your extensions one-at-a-time to the clean profile, testing for this bug after each one. That would presumably narrow down the problem. I guess you might even find that you install *everything* and still can't reproduce this bug, which would suggest a problem with your old profile.