Is there any way, via about:config or otherwise, to prevent Firefox from closing when app tabs are open?

I'm using Firefox 5.0.1 and 8.0a1 nightly.

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I am really not sure what you mean. Please clarify. – user606723 Aug 2 '11 at 15:22
@user606723 - I am exactly sure what Jags means. support.mozilla.com/en-US/kb/what-are-app-tabs – Shinrai Aug 2 '11 at 15:23
Thanks. Didn't know about app tabs. Anyway, this functionality works for me by default. I should add that upgraded from firefox 3, and still have the firefox 3 look and feel and whatever firefox 3's defaults are. – user606723 Aug 2 '11 at 16:05
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Browser.tabs.closeWindowWithLastTab set to false does it for me.

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@ user606723 & Shinrai – Jags FL Aug 2 '11 at 16:17
@ user606723 & Shinrai many thanks. What I meant, when I have 2 or more app-tabs open & if I accidentally close (red X at top right corner) Firefox, Firefox won't even display a warning that it usually displays when I have 2 or more regular tabs open and if I tries to close Firefox. What I would prefer (my personal 1st choice option) is that Firefox throw an error that first you need to close app-tab manually (right click on app-tab and click close) then you can close Firefox. My 2nd choice would be FF throw a warning that it displays while closing 2 or more regular tabs. Any workarounds? – Jags FL Aug 2 '11 at 16:28
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