Of course there is. If they're HTTP, they're insecure, which makes them an open attack vector.
Modern computer security is about removing as many known possible attack vectors as possible.
So that's the benefit.
EDIT: to those saying browsers are sandboxed or that there's nothing sensitive, it projects against e.g. Comcast injecting JavaScript into pages from other sites. [1] There are all sorts of types of bad actors out there. Surely I don't need to list them all here.
Modern computer security is about removing as many known possible attack vectors as possible.
So that's the benefit.
EDIT: to those saying browsers are sandboxed or that there's nothing sensitive, it projects against e.g. Comcast injecting JavaScript into pages from other sites. [1] There are all sorts of types of bad actors out there. Surely I don't need to list them all here.
[1] https://thenextweb.com/insights/2017/12/11/comcast-continues...