Firefox add-ons

Question

What Firefox add-ons do you use that are useful for programmers?

Answer 1

I guess it's silly to mention Firebug -- doubt any of us could live without it. Other than that I use the following (only listing dev-related):

• Console²: next-generation error console
• DOM inspector: as the title might indicate, allows you to browse the DOM
• Edit Cookies: change cookies on the fly
• Execute JS: ad-hoc Javascript execution
• IE Tab: render a page in IE
• Inspect This: brings the selected object into the DOM inspector
• JSView: display linked javascript and CSS
• LORI (Life of Request Info): shows how long it takes to render a page
• Measure IT: a popup ruler.
• URL Params: shows GET and POST variables
• Web Developer: a myriad of tools for the web developer