Here’s a quick Twitter productivity tip in Firefox 4!
Firefox 4 allows you to pin web app tabs so they are always available right when you login. Once you are logged into a web app, just click and drag on the tab to the left side of your tabs. Now, instead of a big long tabs, you’ll have a nice snug tab with just the favicon appearing, rather than the page title.
This works well with Twitter, email web apps, whatever.