Opera just pulls off everything better, no matter how hard I try to make Firefox have the same level of functionality as Opera, it just doesn’t work as well. For instance, the zoom function: zooming works so incredibly well in Opera, increasing the zoom actually renders the entire page larger, text AND images, zooming on Firefox only increases the size of the text making it disproportional to the images. For me, this is very important because I like to sit far away from the screen and zooming in on the page makes things a lot easier to read.
And another thing, I cannot for the life of me, find a plugin that allows you to scroll through the tabs by last use, instead of left to right. It makes no sense to me why one would access the tabs from left to right order, instead of last used, of course one would want to switch between the 2 pages we use last; more than that, the first scroll of the wheel only activates the menu to select your tab, it doesn’t automatically select the left or right tab right away, so to scroll to the tab to the right, you have to move the scroll wheel twice. To move to the tab 2 tabs away from the current tab, one has to scroll a total of 3 times. What the heck is that!?!??
I also found a lil comparison on browser speed that shows Opera is still on top for speed, albeit only slighly faster: http://www.howtocreate.co.uk/browserSpeed.html#testresults
check out this article on tuning firefox: http://www.kuro5hin.org/story/2005/3/12/213345/995. hopefully it’ll make firefox more comparable to opera.