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A lot of settings on Firefox for Android need about:config, but I cannot open it by typing in the address bar.

Here are the screenshots.
Waiting 15 seconds after I typed about:config in the address bar and pressed Enter The version of Firefox app (v88.1.3)

What am I doing wrong?

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2 Answers 2

Reset to default
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You can go to

chrome://geckoview/content/config.xhtml

To get to what you'd normally see with about:config. There, you can also turn on general.aboutConfig.enable, but that is reset after closing the app for some reason.

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about:config is disabled in builds other than Nightly
From this answer:

You can access about:config in the Nightly build of Firefox for Android, available from the Google Play store .

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  • 2
    about:config also works in Firefox Beta.
    – Aenfa
    Commented May 17, 2021 at 0:30

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