Teste dieses Skript:
JavaScript
(function() {
if (!window.gBrowser)
return;
gBrowser.tabContainer.addEventListener('dblclick', event => {
if (event.button != 0)
return;
let node = event.originalTarget;
while (node != gBrowser.tabContainer && node.localName != 'tab' && node.localName != 'toolbarbutton') {
node = node.parentNode;
};
if (node == gBrowser.tabContainer) {
event.preventDefault();
BrowserOpenTab();
};
});
})();
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