By default, Facebook for Android opens the link in the in-app browser.
If you want to open the link in your default browser instead of the in-app browser, then you need to disable Facebook in-app browser and here are the steps:
That's it. The Facebook in-app browser is disabled successfully, and from now on, the link will be opened in your default browser.
In case, if you want to enable Facebook in-app browser, follow the above steps.
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How to Disable Facebook In-App Browser on Android