How to loose your Firefox tabs

You think Firefox restores your tabs when you close and open it (with Tab Mix Plus or the session saver). Don't bet on it, try the following sequence:

  1. Open the Download window
  2. Open a few tabs
  3. Close the main firefox windows
  4. Open a new firefox instance (only the homepage is opened)

You have now lost all your tabs. If those contained any resident information or things you wanted to read/follow up they've been lost :-/

So if you didn't know the Download page was still open somewhere, starting a new firefox will loose your collection of tabs.