Okay, I’ve got some gripes with Firefox.
First, the “new tab” shortcut. You double click to the right of the rightmost tab. I love that shortcut, until I have so many tabs open that the space between the rightmost tab and the “close tab” button is about four pixels wide. The “close tab” button is a red square with a white “x.” They should add a “new tab” button that is a green square with a white “*.”
Second. Firefox should force websites to take advantage of tabs. One of the great benefits of tabbed browsing is that there is only one browser window. It means I don’t have to move the mouse pointer to the task bar to change browsers. But a lot of websites incorporate links that open in new windows. A lot of times this makes sense with the IE model, but when my broswer supports tabs, I would much rather “new window” links open in a new tab.