I want a practical browser that does what I need it to. Yet with each new release of Firefox we tend to see further useful functionality stripped away, additional config panel options removed, and the UI dumbed down in one way or another. So whenever an update happens, it's off to searching for add-ons to basically undo whatever unhelpful changes the developers have just made.
Add-ons and customization should be there to enhance and already good piece of software. They shouldn't be there as band-aid that's applied to fix the numerous mistakes and bad decisions of the software's developers.