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Firefox UI looks different again, how do I fix it this time?

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Firefox's user interface changed again. I like the old, blocky visuals. How do I get them back?

I've already tried about:config>browser.proton.enabled

Firefox's user interface changed again. I like the old, blocky visuals. How do I get them back? I've already tried about:config>browser.proton.enabled
Attached screenshots

All Replies (4)

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Hi Andrew

That preference setting was only left in for testing purposes and has now been removed from Firefox.

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I need to know how to get the UI back to the blocky version.

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I don't know what you mean by blocky version. To change the UI you need css: https://support.mozilla.org/en-US/questions/1346582#answer-1434487

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After learning the terms for the UI's, I would like to specify that I would like to revert my browser back to the "Photon" appearance.