This is applicable for Android devices.
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It is very annoying to open a link from a post in the Facebook app on the phone, only to see it open within Facebook in their default “browser”?

You lose the screen you were on in Facebook and also don’t have your normal Chrome or other browser settings available to you on the new website page. SO if you want to open link in Chrome or other browsers, sometimes YouTube App, try this procedure.

Open the Facebook App
Click the “hamburger icon” menu near the upper right corner
Scroll down to “Settings & Privacy” and tap the down arrow.
Tap settings
Scroll all the way down and tap “Media and Contacts”
Toggle on the “Links open externally” button.
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