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If the wrong app always opens a link:

Often used in regions with strict internet censorship or by users looking to utilize "zero-rated" data (data that doesn't count against a cap).

There is no legitimate "Firefox Handler APK" from Mozilla. Only download Firefox for Android from the Google Play Store or Mozilla’s official website. That app will handle links, PDFs, and other files automatically once you set it as default.

The ability to disguise the browser as a different device or browser version to access restricted content. Key Features

To use these features on Android, you first need the browser. You can find official APKs on the Mozilla Archive Server

Because these are modified by third parties, there is no guarantee that your data is not being intercepted.