Initiated the slow rollout of multi-process architecture (e.g10s), separating web content processing from the main browser interface to improve stability.
Standard rapid-release versions. Note that was the last version before the major transition in v52. v52 ESR
: Firefox 52 ESR was the final version to support classic "legacy" extensions ( XUL-based ). Many beloved power-user tools like Classic Theme Restorer or DownThemAll! (in its original form) only function on these older builds. Operating System Compatibility :
: This is the most significant legacy version. It was the last version to support Windows XP and Vista . It also notably maintained support for legacy NPAPI plugins like Java, Silverlight, and Acrobat , which were dropped in the standard Firefox 52 release.