Hey @MW
Any extensions like this are browser-specific so if you want to use it on multiple browsers you'd need to enable it on those browsers but this also means that their functionality is limited to when Trello is being used in a browser as it changes settings locally on that device only.
If you want to be able to use this functionality across web and desktop versions of Trello, I'd recommend reaching out to the team who develop the extension to see if they're able to convert their extension into a Power-Up instead as Power-Ups also apply to our desktop app.
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