We hoard old browsers like saints hoard relics. Firefox 1.0 reminds us of liberation from IE6. Firefox 3.0 reminds us of the download record. But Firefox 450.1? That’s a message in a bottle from a timeline where the open web survived just long enough to witness its own quiet extinction.
While users can still find version 45.0.1 in Mozilla's FTP directory or on sites like OldVersion.com, Mozilla strongly advises against using legacy browsers for daily tasks. mozilla firefox 450 1 old version
: Websites and web applications often update to be compatible with the latest browsers and technologies. An older version of Firefox might not be compatible with all modern web content. We hoard old browsers like saints hoard relics
For many, Firefox 45.0.1 is sought after because it was one of the last versions to support older operating systems reliably. But Firefox 450
Mozilla Firefox version numbers typically follow a major.minor.patch numbering scheme, but publicly, we usually just refer to the major version (e.g., Firefox 100). Reaching version 450 would imply a completely different kind of numbering or a very dramatic change in the software, which isn't how Firefox or most software updates work.
Released over a decade ago, version 45.0.1 was a minor update focused on stability and fixing specific technical issues.