Is this a new thing? Most of the time when I've installed extensions I've just seen an initial prompt that says the extension can view and modify your data on any page, so either agree & add, or get out.
https://www.ghacks.net/2018/10/01/chrome-70-features-option-...
Edit: I don't like that it seems to not be the default though... if you don't see this option then it's the same situation as before.