FYI: Greasemonkey is an ancient opensource browser exstension that lets you run arbitrary JS/CSS on any site https://greasyfork.org/en
Here is one I made to add a fakespot link next to amazon ratings https://gist.github.com/jeregrine/18865dd9a50cd2b864a5ae2d7d38f1d1
Also on srht because I constantly forget I can do pastes there https://paste.sr.ht/~jeregrine/038a7f0ae47239bac90b912a3fd78254174789e0
The fact that browsers leaned into "extensions" instead of these user scripts tells you all you need to know.
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