Neat! Though I feel like this needs to be "integrated" into something else to achieve full potential. I think a lot of people end up falling down wikipedia rabbit holes (me included!) and something where my browser can provide the same sort of "topic quicklinks" that wikipedia articles have [0] but for anywhere on the web? I'd love that!
[0] https://en.wikipedia.org/wiki/Very_high_frequency#Electromag... (deep linked to the "Electromagnetic Spectrum" topic quick links, but you might have to click the accordion control to unfold it)