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From birdsite (https://twitter.com/Theobromia/status/961005493564026880)
"palemoon" is not a registered trade mark
https://search.uspto.gov/search?utf8=%E2%9C%93&affiliate=web-sdmg-uspto.gov&query=palemoon
https://search.uspto.gov/search?utf8=%E2%9C%93&affiliate=web-sdmg-uspto.gov&query=pale+moon
My "ignorant developer" list has another name on it. Cool.
@mwlucas Who's the ignorant developer, Theobromia or the palemoon people? A trademark doesn't have to be registered to be enforceable (though it's less strongly enforceable if it's not registered).
Another question, though, would be whether a simple name without any particular font, colour, or similar could be a trademark. I'm not sure about that.
@edavies A trademark has to have a combination of word and presentation, with a specific channel of business.
They could probably make a case--you can sue for anything--but from what I can see, their claim on this trademark is very weak.