NoScript is a security extension for Firefox, available from http://noscript.net/
If you'd like to use both Readability with NoScript, you'll need to follow a few simple steps:

1. uninstall the Readability browser extension (if it's installed)

2. add this exact string to NoScript Preferences > Advanced > XSS
^https?://www.readability.com/articles/queue$

3. add this string to the Whitelist in NoScript preferences
www.readability.com

3. Add the bookmarklets (not the extension) from:
http://www.readability.com/bookmarklets