[greyfade]

It was tried, IIRC, early in Firefox's development. It ended up being scrapped for some reason, and it didn't really work all that well.

Opera has a feed reader, too, but I never really found it to be as usable as Thunderbird or Akregator (neither of which I really like.)

[zeckalpha]

I don't think it was completely scrapped. I know some people who use live bookmarks.