Firefox's Brilliant New Feature
Firefox Leads the Way
From the 'Tab as Apps' files:
It's called the 'App Tab' and it's currently in the Firefox 4 Beta 2 nightlies (so no, it's not generally available, yet).
The basic idea is that there are many web applications (think Gmail) where you want to not just 'bookmark' the site but have a dedicated tab...
Read the rest of this Firefox story at InternetNews