Descriptor

http://babelext.com/ https://github.com/honestbleeps/BabelExt Project thanks to which creating cross browser extensions can be much easier :) Thanks to it I've found new project in Mozilla:  https://addons.mozilla.org/en-US/developers/builder With builder extension are similar to Chrome extensions. At least! :-) There is also another project that tries to do the same thing in different way:  http://kangoextensions.com/ Kango is commercial but is free for open-source and non-commercial projects.

This can be really helpful to promote your chrome extension. http://code.google.com/chrome/webstore/docs/inline_installation.html With this API it can be easy to ask users to install extension without browser sniffing and content script just to disable promotional popup on site when extension in already installed.

In Chrome it is easy to overlook the JavaScript errors, but there is extension for it: https://chrome.google.com/webstore/detail/jafmfknfnkoekkdocjiaipcnmkklaajd