function saveOptions(e) { e.preventDefault(); browser.storage.sync.set({ color: document.querySelector("#color").value, }); } function restoreOptions() { function setCurrentChoice(result) { document.querySelector("#color").value = result.color || "blue"; } function onError(error) { console.log(`Error: ${error}`); } let getting = browser.storage.sync.get("color"); getting.then(setCurrentChoice, onError); } document.addEventListener("DOMContentLoaded", restoreOptions); document.querySelector("form").addEventListener("submit", saveOptions);