When Mozilla Firefox is installed from the installer, it (optionally?) installs the Mozilla Maintenance Service. In Windows, the Apps & Features (old: Add/Remove Programs) list adds the Mozilla Maintenance Service in the list of programs it can uninstall. The version number entered here is the version number of the Mozilla Maintenance Service upon installation. Other methods of updating Firefox may update this service (current release version: 102.0.1.8221) - however, the version number contained within the Windows Apps & Features (old: Add/Remove Programs) list is never updated, and will instead display the original installation's version number. I'd like to recommend that this be fixed, so that the version displayed in Apps & Features (old: Add/Remove Programs) always displays the current version installed. (One of those flaky "software updater" utilities pointed this one out to me. "You have an old version of the Mozilla Maintenance Service installed!" yes, if you go by the numbers offered by the Apps & Features list...