This is the source of the New-Tab-In-Tab-Context-Menu add-on. It is not a great add-on, but you can learn how to add simple menuitems to Firefox's menu.

==Installing addon-sdk== First of all, you need to install the addon-sdk. Simply download it and extract where you like, I have installed it in d:\addon-sd.

Activate the addon--sdk, from commandline:

cd addon-sdk\bin
activate.bat

Build it with this command:

cfx xpi

To test use:

cfx run

For documentation about the addon-sdk use:

cfx docs