I recently updated to Mozilla Firefox 0.10.1 and I tried the new Live Bookmarks feature.
It’s a quite nice feature, on each rss-suporting webpage you can subscribe to this feed via a ‘Live Bookmark’.
You can easily refresh this live bookmark folder. If there are new items in the feed, your bookmark folder will be updated.
Sadly there is no flag for new bookmarks, so there is no ‘unread’ – funcionatlity. I also miss a preview feature, a rss sidebar would be nice.
Despite of all this, I think Firefox is takeing the right direction, for me RSS support for a web-browser is a basic requirement.