Kind of, but with automation. So if you trust site A 90%, and site A trusts site B 90%, then from your PoV, site B has 81% trust* (which you can choose to replace with your own trust rating, if you want).
Could have applications in building a new kind of search engine even.
- I'm just guessing how the maths would work, it probably requires a little more sophisticated system that that, such as starting sites at 50% and only increasing or decreasing the rating based on sites you already trust.
The root of the issue is this idea that a web browser should be an "everything app" that can basically recreate the functionality of any other app on the system. It's total feature creep, and in addition to privacy issues, creates a barrier-to-entry that makes it very hard for people to create new browsers because of the sheer amount of features they're expected to implement.