Add missing download Firefox for Android links to the website

[Ponda]

Firefox for Android APK is publicly available, however, it is hidden from downloads page and discovering the URL requires significant research. Please add URL to download page as an option. You can also add Obtainium as an option – a working Obtainium configuration for each browser edition is available here.

This change requires minimal effort, as all resources necessary are already publicly accessible, the only issue being their discoverability. Alternate download is essential even as Google cracks down on sideloading – Play Store is not available in every region, including China, as well as on Android forks not reliant on Google Play Services.

[Jon]

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