I was looking at that one (Cooliris) but was a little put off by this: Problematic Extensions (scroll down to find Cooliris).
Here is my FireFox Achieve. You'll find some handy tips and add-ons there. In particular, I suggest you read FireFox Tips. I'm 99% sure you'll learn something new .
Okay, I've been messing about with some new add-ons and have found these little gems: Interclue (preview a link before you click.) Outwit (Lets you harvest content) BlogRovr - For blog rss - you really need to try this to see quite what it does.
Interclue is nice, CoolIris is awesome though it causes me pain the butt sometimes, Better Gmail 2 made my gmail looked nice.
OH! Someone who uses ScribeFire! I posted another thread somewhere asking if anyone had used it and what did they think, etc. but didn't get any takers. What do you think of it? Have you used the advertiser signup part?
I have used Scribefire a bit. Although it is a nice idea, It doesn't seem very stable to me (trouble connecting to my blogs and posting), so it actually wasn't saving me any time over just having a separate FF tab signed in to whatever site I'm working on for a particular day. I didn't uninstall it though, and still use it as a notepad occasionally.