The final version of Firefox that officially supported Android 4.1-4.4 was Firefox 68.11.0 ESR It uses the older engine, which lacks modern performance optimizations like
Before we dive into the download links, we must understand the problem. Android 4.2.2 uses an old WebView component (the engine that renders web pages). Modern websites use TLS 1.3, new CSS grids, and JavaScript frameworks that simply crash on the stock Android browser. Firefox Apk Android 4.2.2
Even older versions of Firefox included early iterations of tracking protection and private browsing. Sync Capabilities: The final version of Firefox that officially supported