Features Web Browsers should have

Here's some features I would like it if web browsers had.

  1. Spell checker
  2. Search and replace in text editor fields
  3. Keep track of what I've typed in text fields in case the server eats it
  4. Better text editor in general!
  5. web discussion tracker to keep track of my posts
  6. RSS reader
  7. Ability to archive everything I've looked at, then search it (say, 30 days or up to n GB worth of data)

I know you can get some of these using add-ons for various browsers (and I think Safari has a spell checker). But wouldn't it be nice if most of these things were available out-of-the box?