As many of you know, I'm not a heavy add-on user. Firefox gives me almost everything I need right "out of the box". Over the last couple of years, I have come to rely on a couple of add-ons though, the longest lasting of which is Resizeable Form Fields. Eventually, I believe this is the kind of extension that should be folded into Firefox. It's low impact on those who don't need it and mighty useful for those who do. I often think of it like a resizeable top-level window. My mom may keep all of her windows the same size, so she might not ever need to have that little window resizer widget down in the corner. Well, she gets it anyway. The good news is that it doesn't get in her way while it gives me the opportunity to be much more productive by making windows the sizes I prefer.
As of late I've also replaced the built-in DOM Inspector with Joe Hewitt's amazing Firebug add-on. I do a little bit of web development here and there and I occasionally file bugs on broken websites so this tool has become a real companion for me. It's definitely not in the category of extension that belongs folded in to Firefox (and now that we've got a better alternative, and Firefox's add-on system is much stronger, I'd actually like to see DOMI removed from Firefox.)
So, what add-ons do you use? What do you use them for? Do you have any interesting anecdotes about using add-ons to spread Firefox to others? Which add-ons do you think should be folded in to Firefox?
