Best addon ever created! Rated 5 out of 5 stars
Firebug allows me to quickly get a glimpse of a client’s website. It is the ultimate development tool; nothing comes near what Firebug does and how much time it saves me.
Firebug made learning new languages a lot easier for me too, in fact I used firebug to understand and learn CSS. Allowing me to quickly look at the entire site, or inspect individual items. Firebug operates in your browser live, allowing you to even make quick changes or see how something would look if you altered it without reloading the page or uploading new files. Before Firebug I would try and look over my local files and make small alterations, than upload the changed files and reload the page to see if it did what I wanted. On average Firebug saves me at least 10 hours of development time per site.
Firebug is truly a master piece of the open web, allowing you to learn from others and be more productive.