Note: it looks like based on @catsaladCat 🐈🥗 (D.Burch) :paw::paw:'s infosec.exchange/@catsalad/115 Firefox is doing something nasty where it removes the "chrome://" prefix from anything you paste into the URL bar. So you need to manually re-type it after pasting. Or paste it into bookmark contents and use the bookmark, if that works.

@daliasCassandrich @catsaladCat 🐈🥗 (D.Burch) :paw::paw: 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.

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