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@dalias @catsalad interesting. When you copy it with a leading space included it is not filtered and works without having to remove the space.

" chrome://geckoview/content/config.xhtml"

You can then toggle the setting general.aboutConfig.enable to true to enable about:config again.

The Fennec build (available on F-Droid) does not have this limitation, you can just visit about:config right away.