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What version of Firefox are you using? It hasn't done that in ages. You have to open the About window to check for new updates and install them.

• kbrosnan 12y ago
  Non-Windows still has modal update dialog. On startup for non-Windows you are blocked from using the browser until the update is complete. There is a dialog if you run out of date extensions. There is a nag dialog if you have an update pending for over 24h.
  • nly 12y ago
    What platform? Most Linux distros compile Firefox with "--disable-updater --disable-installer", such that Mozillas auto-update doesn't even exist.
    • kbrosnan 12y ago
      OS X and Mozilla Linux builds.