Open the Firefox menu and go to > Advanced > Update . Select "Never check for updates (not recommended)" .
On the other hand, Firefox 51 was the regular version, which was still supported but would only receive security updates for a short period. Firefox 12 was an older version that was no longer supported.
Integrated Firefox Hello (a built-in WebRTC communication tool) and switched the default search engine in North America from Google to Yahoo. Firefox 36 to 51: Pre-Quantum Refinements
If left to its default behavior, an old Firefox installation will immediately reach out to Mozilla servers upon launch, download the newest modern version, and overwrite your legacy installation. Download Firefox 12-51 52 Esr
Using archive.mozilla.org :
Crucial for Java, Silverlight, and legacy enterprise systems.
Navigate to your platform (e.g., /win64/ for 64-bit Windows or /mac/ for macOS) and select your language (e.g., en-US ). Open the Firefox menu and go to > Advanced > Update
The introduction of hardware acceleration and the IonMonkey JIT compiler significantly sped up page loading.
Check the box for . Reconnect your internet connection. Managing Security Risks
Select .
The software ecosystem changed dramatically during this five-year window of web history. Understanding what makes these versions unique is essential before choosing a specific version to install.
This range spans from 2012 to early 2017. During this era, Firefox transitioned through rapid release cycles, introduced the Australis interface, and gradually phased out older operating systems. Firefox 45 to 51 began preparing users for the deprecation of legacy plugins, making these versions a sweet spot for users who need a classic browser experience without the constraints of the WebExtensions-only era. Firefox 52 ESR (Extended Support Release)
