The Firefox Screencap Project: Karen's Firefox
I use Firefox as my default browser, and have for almost three years. It's a real workhorse. The tabs make it easy to have all of the resources I need for webdesign readily accessible, and the extensions available make each of my profiles unique to its own purpose.
I use the Performancing extension for blogging, and the Permanent Tab extension makes it easy to save my place as I work on projects. I've arranged my toolbars the same way for a while, and I can nearly find the icons I need with my eyes closed.
Firefox is incredibly flexible and I enjoy its security, and I do not open any other browser except in dire emergencies.
To participate in The Firefox Screencap Project see here for information.