Switched to using localStorage; incremented version to 1.2.6

src/contentScript.js

 /******************/
 
 function initialize() {
-	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
+	chrome.storage.local.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
 		let shouldKillSticky = checkForShouldKillSticky(result);
 		updateIcon(shouldKillSticky);
 		if (shouldKillSticky) {

src/options.js

 	let matchingPatterns = document.querySelector("#matchingPatterns textarea").value;
 	let exclusionPatterns = document.querySelector("#exclusionPatterns textarea").value;
 	let mode = document.querySelector("input#whitelist-mode").checked ? "whitelist" : "blacklist";
-	chrome.storage.sync.set({
+	chrome.storage.local.set({
 		"matchingPatterns": matchingPatterns,
 		"exclusionPatterns": exclusionPatterns,
 		"mode": mode
-	}, () => { setButtonsActive(false); });
+	}, () => {
+		let error = chrome.runtime.lastError;
+		if (error) {
+			alert(error.message);
+		} else {
+			setButtonsActive(false);
+		}
+	});
 }
 
 /*	Retrieves the saved state from storage and reset the UI to reflect it, 
 	discarding the user's changes.
 	*/
 function resetChanges(callback) {
-	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
+	chrome.storage.local.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
 		AKS.matchingPatterns = result.matchingPatterns || "";
 		AKS.exclusionPatterns = result.exclusionPatterns || ""
 		AKS.mode = result.mode || "blacklist";

src/platform/chrome/manifest.json

 {
 	"manifest_version":	2,
 	"name":				"AlwaysKillSticky",
-	"version":			"1.2.5.2",
+	"version":			"1.2.6",
 	"description":		"Get rid of sticky elements on websites - permanently!",
 	"author":			"Said Achmiz",
 	"homepage_url":		"https://git.sr.ht/~achmizs/AlwaysKillSticky.git",
-	"permissions":		[ "activeTab", "storage" ],
+	"permissions":		[ "activeTab", "storage", "unlimitedStorage" ],
 	"background":		{
 		"scripts":			["background.js"],
 		"persistent":		false

src/platform/firefox/manifest.json

 {
 	"manifest_version":				2,
 	"name":							"AlwaysKillSticky",
-	"version":						"1.2.5.2",
+	"version":						"1.2.6",
 	"description":					"Get rid of sticky elements on websites - permanently!",
 	"author":						"Said Achmiz",
 	"browser_specific_settings":	{
 		}
 	},
 	"homepage_url":					"https://git.sr.ht/~achmizs/AlwaysKillSticky.git",
-	"permissions":					[ "activeTab", "storage" ],
+	"permissions":					[ "activeTab", "storage", "unlimitedStorage" ],
 	"background":					{
 		"scripts":						[ "background.js" ]
 	},

src/popup.js

 	chrome.tabs.query({currentWindow: true, active: true}, (tabs) => {
 		AKS.activeTabLocation = tabs[0].url;
 		AKS.activeTabID = tabs[0].id;
-		chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
+		chrome.storage.local.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
 			updateState(result);
 			updateUIState();
 		});
 	// Listener for main button.
 	document.querySelector("button.main-button").addActivateEvent((event) => {
 		/*	This doesn’t actually kill the stickies yet; that’s below, in the 
-			callback to storage.sync.set. */
+			callback to storage.local.set. */
 		toggleState();
 
 		// Prepare the changes for saving.
 			changes.matchingPatterns = AKS.matchingPatterns.join("\n");
 
 		// Save the changes.
-		chrome.storage.sync.set(changes, () => {
+		chrome.storage.local.set(changes, () => {
+			let error = chrome.runtime.lastError;
+			if (error) {
+				alert(error.message);
+				return;
+			}
+
 			// Update the UI, once changes are saved.
 			updateUIState();
 			let reloadButton = document.querySelector("button.reload-button");