The company’s team clarified that their terms prohibit third-party apps from disabling ads, as it denies creators their due reward for viewership. Although the announcement did not specify any app by name, it’s plausible to presume that third-party YouTube apps such as NewPipe, YouTube ReVanced, Piped, and others might be implicated.
They probably will eventually, but it’s just not priority. Most people interact with YouTube via Chrome (or one of the 400,000 rebranded Chromimum browsers) or the YouTube app, both of which Google can more tightly control. Firefox, with it’s smaller market share, just isn’t worth chasing… yet.