Since I've been using FF I only had this happen twice now but it is annoying. I have FF set to check for updates but let me decide when to install them, so today I click the three stripes in the top right corner > The question mark (?) > About Firefox. This is normally where FF tells me there's an update available, but this time when I clicked to update to FF32 it said to Restart to update. I restarted FF but that didn't help, so I restarted my system, still no joy. Finally I had to download and install FF32 over FF31, which finally worked.
Has anyone else had this while updating to FF32?