I’m a HUGE fan of Google Docs. And for you Word addicts, whenever I hear a complaint from a Microsoft Office user about Google Docs, it’s usually about some bs feature that I don’t need.
Anyhow, I use Google Docs to take notes on projects/subjects I’m working on / learning about and thus tend to have a lot of tabs open. To prevent firefox from getting bogged down, I’ve started running Google Docs with Mozilla’s Prism. I’m not sure if Prism supports Addons (better gmail2), or else I’d probably use it for Gmail, too.