var android = false; var gettingInfo = browser.runtime.getPlatformInfo(); gettingInfo.then((got) => { if (got.os == 'android') { console.log('Running in Android detected'); android = true; return true; } else { console.log('Running in Desktop detected'); android = false; return false; } }); function isDroid() { console.log('android?', android); if (android == undefined) { return false; } return android; } function notClosable() { return false; }