Examine source code of Proton UI

By: Vulta Theme

Inspect and view changes in Proton UI source codes across current and past versions

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Best Proton UI Alternatives

Here are some Firefox add-ons that are similar to Proton UI:

matte black (for proton)

cottagedwellingcat

Proton Dark (FF Theme)

Proton Google Chrome Light

Readable Proton Theme

Minimalistic Orange

Enhanced Default