Firefox themes - increase fingerprinting?

I've been using a dark theme made by Mozilla themselves for some time now, but wanted something a bit more warm toned. I've found some I like, but they often have less than 10 users.

I know that having more add-ons increase your fingerprint-ability, but what about themes? Do they at all affect that? And if so, I'd guess it would be better to stick with ones with more users to blend in more? Or does amount of users affect …

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