Mozilla Firefox Apk For Android 4.4 2 -

or higher, version 68 remains the final "legacy" build for KitKat users who need a functional browser on older hardware. Why Version 68 is the "End of the Road"

Modern Android 4.4.2 devices can rarely access the latest apps via the Google Play Store Mozilla Firefox Apk For Android 4.4 2

First run:

Open your Downloads folder, tap the .apk file, and follow the prompts to install. Important Considerations or higher, version 68 remains the final "legacy"