Each day Firefox is impressed me with its powerfull features and add-ons, i am not talking about Firefox 3 (October 2007) that support offline application such as Google Docs & Spreadsheets but I am talking about the current release. I usualy looked for a Javascripting Debugging tools with break points and and tracing facilities until I found one, it is JavaScript Debugger – an add-on to Firefox – really it is amazing try it by yourself. Moreover there is another amazing tool for debugging and inspection (HTML, JavaScript, CSS) even it gave you statics about the Net usage for each element in your page; it is called Firebug. I Know every developer will love these tools and will be amazed by the add-ons that offered by Firefox.