Mozilla Firefox 45.0.1 was a minor stability update released on March 16, 2016. It arrived roughly one week after the major release of version 45.0 to address critical bugs and performance issues discovered in the initial rollout. Key Features and Changes in Version 45
If you recall using a version that felt "almost like Firefox 4 but with weird glitches," you were likely on the 4.5.0.1 beta. mozilla firefox 450 1 old version
channel, which is expected to support older systems like Windows 7 and 8.1 until approximately February 2026 Security Risk : Using version 45.0.1 is not recommended Mozilla Firefox 45
In 450.1, every page loaded into a transient sandbox. mozilla firefox 450 1 old version