My add-on https://addons.mozilla.org/en-US/firefox/addon/categorize/ combines bookmarks and tab-management. It lets the user group bookmarks into sets that a user can open all at once or singly. This approach almost completely eliminates the need for an address bar.
Another interesting feature of the add-on is that it unifies bookmarks and web-search. The two seem totally disparate but they can be integrated seamlessly in a very cool way. Check http://techuser.net/beyond-chrome.html for an overview of the approach.
The Firefox teams seems to no longer care about add-ons and add-on users. I am an Add-on author. I submitted an updated version of my addon for Firefox 8 on October 27. Twelve days later the new version is still sitting in a sandbox waiting editorial review. With a new release happening every 6 weeks this kind of behavior is inexcusable and will likely drive people away from Add-ons.
I beat the 350 MB by going to the Atlas Obscura website. Firefox managed to use up 550 MB with only a single tab open. This too after a clean start. Firefox just keeps on leaking memory when the Atlas Obscura website is open.
I hate saying this but Firefox 4 is shaping to be a disaster of epic proportions. The Javascript benchmarks are all nice and good but dear Mozilla folk you people also need to write a garbage collector for your implementation of Javascript that actually collects garbage.
Firefox 4 is a memory hog compared to Firefox 3.6. Worse, it leaks memory like a sieve. After a bit of browsing, it is using 350 MB with just a single tab open. Firefox 3.6 uses half that much memory on the same machine.
Another interesting feature of the add-on is that it unifies bookmarks and web-search. The two seem totally disparate but they can be integrated seamlessly in a very cool way. Check http://techuser.net/beyond-chrome.html for an overview of the approach.