Instead of the risky downgrade, consider these modern alternatives:
Completely remove your existing Firefox installation. On Windows, use the Control Panel's "Uninstall a program" feature. On macOS, drag the Firefox application from the Applications folder to the Trash. On Linux, use your system's package manager (e.g., sudo apt remove firefox ).
You might be reading the title and thinking, “Firefox 450.1? That can’t be right.” And you’d be correct. The Firefox browser has never had a version numbered 450.1. Its version history is long—stretching from Firefox 1.0 in 2004 to the modern Firefox 100+ series of today—but it has never jumped to a triple-digit version number that high. mozilla firefox 450 1 old version
Firefox will try to update itself to the newest version. You must turn this off immediately: Options > Advanced > Update > "Never check for updates" .
Tip: If you need an older version for daily browsing on an old computer, use or look into fork projects like Pale Moon or Waterfox , which maintain security patches for older operating systems. If you want, tell me: Instead of the risky downgrade, consider these modern
Legacy browsers lack updated Root Certificates, meaning they will flag almost every secure HTTPS website with an untrusted connection warning.
Because 45.0.1 was a point release, it inherited the primary features introduced in the base version 45.0: On Linux, use your system's package manager (e
: Solved a bug that prevented sites from loading correctly when users set third-party cookie permissions to "Never".
While tempting for "minimal computing" or legacy hardware, using version 45.0.1 today poses . Firefox 45.0.1, See All New Features, Updates and Fixes
Modern web properties rely on current CSS Grid, flexbox, and advanced JavaScript frameworks. Loading these modern pages on version 45.0.1 will result in heavily broken, unreadable layouts.