gistfile1.js

Components.utils.import("resource://gre/modules/AddonManager.jsm", null);			//Getting Info of all addons & their URLS...

AddonManager.getAllAddons(function(addons) {
    var s = '';
    for (var addon of addons) {
        if (addon.type == 'extension')
            s += addon.getResourceURI().spec + '\n';
    }
    alert(s);
});