TBB on Linux just asked me if I wanted to update

My TBB 4.0-alpha-3 just popped up a window asking me if I wanted to upgrade (I just uploaded the manifest files).

I had previously clicked on the "Help->About Tor Browser" tab, but I had closed that window several minutes prior.

This probably shouldn't have happened, and it especially shouldn't happen for our stable users. We want them to explicitly navigate to the Help window to upgrade if they want to. At least, until we get legacy/trac#11955 (moved) and legacy/trac#13379 (moved) fixed.