That would depend on what your extension does In general, no it’s not illegal to create extensions for sites you don’t own. If it was, you wouldn’t have all those extension that mess with sites like YouTube
1 Answers · Computers & Internet · 06/06/2019
Because anyone can put nonsense on the internet in seconds and spread it widely in a short amount of time.
4 Answers · Computers & Internet · 11/06/2019