I have made several substantial updates to my Firefox Toolbar Tutorial. Here's what's new:

• Chapter 6: Scripting the Toolbar has been heavily updated. No longer do I recommend using prefixes before your function and variable names. Instead, all functions and variables are encapsulated in a JavaScript object, keeping the global JavaScript namespace pollution free.
• All sample XUL and JavaScript files have been updated to reflect the change made above.
• The installable version of the tutorial toolbar has been updated with the changes above, and is now compatible with all 4.0 builds of Firefox.
• Several grammatical errors have been fixed, and broken links have been repaired.

If you spot any errors, please let me know. Enjoy this update!