* Display as a simple icon within the location bar
** 16x16 icon currently maybe higher DPI in the future
* Display as a simple icon
** 16x16 icon currently maybe higher DPI in the future
* Display as a small widget in the toolbar (this is a restriction over what we currently support)
** Sizing suggested as being a maximum of 4 times an icon, so 64x16
The following behaviours need to be supported:
** The add-on developer provides a url to use for the sidebar content
** Fire events when toggled on/off
|Feature ux design=Woo mockups: http://people.mozilla.com/~shorlander/files/addons-in-toolbar-i01/addons-in-toolbar.html
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