Hi, I am trying to test along the tabs onUpdated event on a simple web extension/addon under Chrome. I used the Safari XCRUN converter ! What I am trying to do is : 1- Open new tab on Google Scholar with set prefs params, from "options.js" script (code below) 2- Listen for tab to be updated and ready (e.g. tab status is complete) 3 - Then, inject a content script that will simulate the user click on save button 4- Then wait 1,5s (for GS tab to reload and finish saving) and remove the listener 5- Finally close this GS tab and back to extension Options page tab. // Detect browser language const gsUrl = currentBrowser.i18n.getUILanguage().includes("fr") ? GSCHOLAR_SET_PREFS_FR_URL : GSCHOLAR_SET_PREFS_COM_URL; // Listener to detect when the GS tab has finished loading const gsTabListener = (tabId, changeInfo, tabInfo) => { if (changeInfo.url && changeInfo.url.startsWith(GSCHOLAR_HOST)) { currentBrowser.tabs.executeScript( tabId, { code: `document.getElementsByName("save")[0].click();`, }, () => { currentBrowser.tabs.onUpdated.removeListener(gsTabListener); setTimeout(() => currentBrowser.tabs.remove(tabId), 1500); } ); } }; currentBrowser.tabs.onUpdated.addListener(gsTabListener); // Add tab listener currentBrowser.tabs.create({ url: `${gsUrl}?inst=${gScholarInstIdList.join("&inst=")}&save=#2`, active: false, }); // Open GS tab according to browser language The problem is that it works well on Chrome/Edge/Firefox, but not Safari : the GS tab isn't closed and nothing happens :-/ PS: Of course tabs onUpdated event is well supported on Safari according to MDN. https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/onUpdated I have also tried webNavigation onCompleted event, but same ! https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webNavigation/onCompleted Thanks for your feedback.