With the last several releases of Firefox and Thunderbird, I have enabled automatic notification of new releases. When I'm notified, the window that pops up has a button saying that lets you upgrade. However, this button doesn't seem to work for me when I click it. This was the same from when I first switched to Linux when it was Firefox 4 or 5 up until the current release of 7 and 8.
The only way to upgrade is to delete the installation files and in its place extract the contents of the new archive file downloaded from Mozilla with the latest Firefox or Thunderbird release.
Am I doing something wrong, or is there really no nice way of one-click upgrading or upgrading at all through the user interface? (Does that only work on Windows systems?) If so I'm surprised they keep that upgrade button on the Linux version of the window popup that informs you of a new version, because it gets users hopes up unnecessarily