function saveOptions(e) { e.preventDefault(); browser.storage.sync.set({ doThumb: document.querySelector("#doThumb").checked, doMaxWidth: document.querySelector("#doMaxWidth").checked, valMaxWidth: document.querySelector("#valMaxWidth").value, doDetect: document.querySelector("#doDetect").checked }); } function restoreOptions() { function onResult(result) { document.querySelector("#doThumb").checked = result.doThumb; document.querySelector("#doMaxWidth").checked = result.doMaxWidth; document.querySelector("#valMaxWidth").value = result.valMaxWidth; document.querySelector("#doDetect").checked = result.doDetect; } function onError(error) { console.log(`Error: ${error}`); } var getting = browser.storage.sync.get({ doThumb: false, doMaxWidth: true, valMaxWidth: "900px", doDetect: false }); getting.then(onResult, onError); } document.addEventListener("DOMContentLoaded", restoreOptions); document.querySelectorAll('.validate').forEach((elem) => { elem.addEventListener('change', saveOptions); });