If you are looking for this specific build for legacy hardware or testing, Mozilla maintains an archive of all past releases. You can find it on the official Mozilla Release Archive Using an outdated browser like version 45.0.1 is highly insecure
Firefox 45.0.1 is highly sought after by retro-computing enthusiasts because it represents one of the final versions supporting older software environments before Mozilla shifted to the Quantum engine architecture. Minimum System Requirements mozilla firefox 450 1 old version
Before you download that .exe from some dusty archive, understand the severe dangers. Using Firefox 4.5.0.1 on the modern internet is . If you are looking for this specific build
: Web developers often require older rendering engines (Gecko) to test how legacy enterprise websites behave under older browser conditions. Using Firefox 4
is a critical security and stability patch released by Mozilla on March 16, 2016, to address key regressions found in the major Firefox 45 release. While users today typically look for this legacy version to maintain compatibility with older operating systems or legacy web applications, running outdated web browsers presents significant modern security risks. Key Features and Fixes in Firefox 45.0.1
