Nice little tool!
From their Github page [0]:
>this plugin was created by GPT-4 in just two hours
It uses the Intersection Observer API [1] to grep visible usernames on twitter.com and then checks the Wikipedia API if the property P2002 (Twitter username) [2] exists.
0: https://github.com/irony/verified-by-wikipedia
1: https://developer.mozilla.org/en-US/docs/Web/API/Intersectio...
2: https://www.wikidata.org/wiki/Property:P2002
