That message refers to an Enterprise Policy, which often is injected by your security software. If you run Linux Mint, it could be a block on Firefox self-updating in favor of your package manager doing it. To learn more about what is going on: If that message is a link, click it (or manually paste '''about:policies''' in the address bar and press Enter to load it). What policy/policies is/are listed on the "Active" panel? '''URGENT''' Some of your Firefox add-ons are going to stop working Thursday, like OneTab. It is critical that you update Firefox now. If your distro does not have an update available, this might indicate that your OS also needs updated. (1) Export your add-on data now in case you are not able to update in time, and make sure you do not have hidden groups that you can't afford to lose. (2) Please refer to the following article: [[Update Firefox to prevent add-ons issues from root certificate expiration]].