Addons Framework

Add-on Framework is a framework that allows you to create cross browser add-ons for all major browsers:
Internet Explorer
Firefox
Chrome
Safari
Opera
Reduce your development time by writing one piece of code that works in all browsers and using common technologies: HTML, JavaScript, and CSS.

Less time developers spent making your plug-in means that you pay less. You don't need to write 5 different snippets of code to make any changes. Write just one to make change to all browsers all at once.