Rated 5 out of 5 stars

I've been using this extension for years now and am glad to finally see Ted finally moved it to AMO.

This extension is an extension developer's best friend. If you're an extension developer, this extension is a MUST-HAVE.

The JS shell (by Jesse Ruderman; included as one of several tools in this extension) with chrome privileges is essential to smooth extension development.

The "Enable Debugging Preferences" makes it a snap to configure new profiles for development; no need to remember javascript.options.showInConsole, disable XUL caching, and associated friends.

The real-time XUL editor makes screen prototyping dead easy. It's also great for sharing/debugging XUL with colleagues over email or pastebins.

The other tools are: an extension builder wizard, javascript environment, javascript injector, real-time HTML editor, regular expression evaluator, and an XPath evaulator.

Ted really needs to be commended for bundling these tools and maintaining this extension. There would be far fewer Firefox extensions -- and buggy ones -- if this extension didn't exist.

This review is for a previous version of the add-on (0.3.0.20080526).