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this.onclick = function(e) {
    if(e.target == this && e.button == 1)
        openAddonsManager();
};
function openAddonsManager(view) {
    var openAddonsMgr = window.BrowserOpenAddonsMgr // Firefox
        || window.openAddonsMgr // Thunderbird
        || window.toEM; // SeaMonkey
    openAddonsMgr(view);
}