[Bug 583797]

[Jan Tojnar]

Updated link describing the behaviour from Comment 10:

https://hg.mozilla.org/mozilla-
central/file/934fe0bd6062/browser/components/nsBrowserGlue.js#l1248

Also pasting it here for easier search:

> There are several cases where we won't show a dialog here:
> 1. There is only 1 tab open in 1 window
> 2. The session will be restored at startup, indicated by
>    browser.startup.page == 3 or browser.sessionstore.resume_session_once == true
> 3. browser.warnOnQuit == false
> 4. The browser is currently in Private Browsing mode
> 5. The browser will be restarted.
> 
> Otherwise these are the conditions and the associated dialogs that will be shown:
> 1. aQuitType == "lastwindow" or "quit" and browser.showQuitWarning == true
>    - The quit dialog will be shown
> 2. aQuitType == "lastwindow" && browser.tabs.warnOnClose == true
>    - The "closing multiple tabs" dialog will be shown
> 
> aQuitType == "lastwindow" is overloaded. "lastwindow" is used to indicate
> "the last window is closing but we're not quitting (a non-browser window is open)"
> and also "we're quitting by closing the last window".

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Cases 2 and 4 are the most annoying.

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https://bugs.launchpad.net/bugs/583797

Title:
  "Warn on closing with multiple tabs open" not honored

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