I see people commenting that there's no point to this because of the CTRL+scroll command, but they seem to not realise that this extension doesn't only give you a slider to zoom in and out, but has other features too, and even if it didn't; this is still useful for people who, for whatever reason, don't want to or even can't use the CTRL+scroll command.
There is absolutely no point in commenting anything like that, if you don't like it; don't use it, simple as. All you're doing is contributing to a narrative that berates people for absolutely no reason, and that makes solutions for accessibility issues unwelcome and chastised. Just stop.