They are working on new Javascript engine which targets to a significant improvement in speed: http://ajaxian.com/archives/mozilla-jagermonkey-method-based...
They are also working on stability and I would bet it will be much better than Chrome (my friend is using Chrome and he reported lots of crashes even though it is designed for "crash free" at beginning). http://www.maximumpc.com/article/news/firefox_implement_outo...
FF is playing catch up on these issues but hopefully, with all other stuffs (Weave, Contact, Account Manager...) that Mozilla is investing in, FF will be the world champion in browser competition market!
Chrome displays it in plaintext. Now you've gotta import it into your reader before you decide if you really even want to subscribe.
Alternatively, would you have suggestions on some other service that provides similar doc capability with html5 database?
* Lack of built-in RSS support. This one kind of blows my mind.
* Worst progress indicator I've ever seen.
* Can't open external links in new windows, have to open in "tab of whatever my last used browser window was".
* Flash crashes more than it does in Safari/Firefox, but I don't blame Chrome for that.
Not exactly constructive to the conversation I guess, but at least the first three things have been driving me nuts for a bit.