I am developing an extension on Firefox\'s Addon SDK (v1.10).
My extension has a toolbarbutton that updates a small badge to its left based on the contents of the ac
Would this be the active window? You can get a window object for the current active window using
windows.browserWindows.activeWindow
Docs: https://addons.mozilla.org/en-US/developers/docs/sdk/latest/packages/addon-kit/windows.html#browserWindows
The window object has a list of tabs currently open in it:
https://addons.mozilla.org/en-US/developers/docs/sdk/latest/packages/addon-kit/windows.html#tabs
If you need to find a tab in a window that isn't the current active tab or window, that might be more difficult to determine. Can you provide more detail about what you're actually trying to do?