User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 While working with some Javascript to implement a calendar, I needed to double-check that such code was running fine by changing the current date/time of the Windows clock. At some point, Firefox prompted me that a newer version was available. I got stucked since the candidate newer version was 2.0.0.6, but my current one is 2.0.0.11 !!! Hence it was prompting for a downgrade. I think that there should be some issue with the rule to detect if newer version is available. Maybe the date/time rule should be refined and think to parse the version number to check which is the latest one. All in all, I think one might want to use this sort of 'bug' appropriately, give users (1) the possibility to upgrade/downgrade Firefox through a list of currently available versions to download or (2) directly update to the latest version. Reproducible: Always Steps to Reproduce: 1. 2. 3.

Changing the time was just coincidence. Bug 485624 and bug 313057 prevent this from happening now... duping