I actually like and use Firebug for web development every single day; sure it is slow on boot for Firefox but I love Firebug once the browser is up. (Update this has been resolved in later editions)
Firefox 10 has a new Inspect and developer mode - it is pretty much like Google Chrome - it sucks, you cannot edit on page CSS, you can edit text and tags simply like Firebug - I would be on Chrome now if it fully had Firebug.
How can I disable firefox inspect? How can I disable the inspect mode in chrome? (I would rather use the light firebug)