Although I don't have much to say about RSS, personally, I have moved on to Chrome, especially after I saw the FF4 beta. There are a lot of things I miss about Firefox though. For one, the extensions: the essentially limitless freedom when it came to addons. Chrome, as well as every other browser aside from FF, is extremely limited when it comes to extensions. I miss being able to have my extensions like ChatZilla, SQLite Manager, Firebug, FireFTP, NoScript (the ability for a noscript-like extension is due to be supported soon though, but thats a whole other story).

I think at least one of Firefox's problems is that its trying too hard to be like Chrome when it was originally good in its own right. For example, I liked the old FF AddOns window, before they turned it into a carbon copy of Chrome's extension tab. They also got rid of the status bar, etc. Then again, every browser seems to be trying to replicate Chrome's minimalistic interface, especially IE9.