Chrome List adds an 'Explore Chrome' item to the Tools menu, from which you can:

• browse the structure of chrome:// as if it were a normal directory tree.
• open chrome:// mapped files in Firefox;
• view the source code of such files;
• save such files to somewhere else;
• inspect where the files are being mapped from (jar files, local directory, etc.);
• look for them in LXR
• launch them (open them in an editor)
• get a list of problems in the currently known chrome manifest files