chrome.runtime.onInstalled.addListener(() => { chrome.contextMenus.create({ title: 'Make Gather fullscreen', type: 'normal', documentUrlPatterns: ["https://gather.town/app/*"], id: 'make-fullscreen', }); }); chrome.contextMenus.onClicked.addListener(async (data) => { if (data.menuItemId === 'make-fullscreen') { chrome.tabs.insertCSS({ file: 'inject.css', }); chrome.tabs.executeScript({ file: 'inject.js', }); } });