I kept getting new version is available while I was up to date. This could be due to this: When I had Firefox in its standard location in C drive, I also installed another copy on my computer's E drive. After a while I uninstalled the E drive version and kept the C drive one. After that I kept getting a new version is available, but could not be downloaded. I follow the links and find out I do have the latest version. When there is a new version out, in Settings - General - Check for updates I always get the message Firefox is up to date. I uninstalled Firefox completely, but kept my profile directory contents. After re-installation, I copied contents of my old profile into the new installation default profile. However, I still get the 'New version is available, but couldn't be downloaded'. The problem is still there. Somewhere in the files in my profile directory there is still a trace of the E drive installation and the update checking looks at that (I guess ? ) Any suggestions would be appreciated.