In the subscription listings, if an add-on is already installed, then the 'Add to...' button should be disabled. A user suggested also giving some other visual clue. Justin, thoughts?
This has been implemented. If the extension is already installed the install button is disabled and a message appears to the user: "You already have this add-on". r27785 Justin, this has required a new string: bandwagon.addon.alreadyinstalled in bandwagonAddon.properties. If the string is missing, the "Add to..." button will be disabled, but the message will not appear.
Verified FIXED using https://people.mozilla.com/~jscott/bandwagon/2009-08-11.xpi.