fix: batch storage reads to reduce API calls with DLP extensions

entrypoints/background.ts

@@ -11,8 +11,10 @@
  */
 
 import {
+	type AllStorageData,
 	clearState,
 	getUrlDetection,
+	loadAll,
 	loadState,
 	saveState,
 	setUrlDetection,
@@ -194,17 +196,20 @@ async function findExistingAgentTab(
  * 3. Update that tab's URL and focus it
  * 4. Close the source tab
  *
+ * PERFORMANCE: Accepts pre-loaded state to avoid redundant storage reads.
+ * The caller loads state once via loadAll() and passes it through.
+ *
  * @param sourceTabId - Tab ID that initiated the navigation
  * @param sourceUrl - URL being navigated to
  * @param match - Matched route details
+ * @param state - Pre-loaded storage state (to minimize API calls)
  */
 async function handleNavigation(
 	sourceTabId: number,
 	_sourceUrl: string,
 	match: RouteMatch,
+	state: AllStorageData["state"],
 ): Promise<void> {
-	const state = await loadState();
-
 	// Find existing LIVE agent tab for this subdomain (not the source tab)
 	const existingTab = await findExistingAgentTab(match.subdomain, sourceTabId, state.zendeskTabs);
 
@@ -239,14 +244,18 @@ async function handleNavigation(
 }
 
 /**
- * Track a tab as a Zendesk agent tab in state.
+ * Track a tab as a Zendesk agent tab using pre-loaded state.
+ * PERFORMANCE: Accepts pre-loaded state to avoid redundant storage reads.
  *
  * @param tabId - Tab ID to track
  * @param url - Current URL of the tab
+ * @param state - Pre-loaded storage state (to minimize API calls)
  */
-async function trackTab(tabId: number, url: string): Promise<void> {
-	const state = await loadState();
-
+async function trackTabWithState(
+	tabId: number,
+	url: string,
+	state: AllStorageData["state"],
+): Promise<void> {
 	// Extract subdomain from URL
 	const match = matchZendeskUrl(url);
 	if (!match) {
@@ -355,16 +364,18 @@ export default defineBackground(() => {
 			// Deduplication: Skip if we recently processed this exact navigation
 			if (isDuplicateNavigation(details.tabId, details.url)) return;
 
-			const detection = await getUrlDetection();
-			if (detection === "noUrls") return;
+			// PERFORMANCE: Load ALL storage data in ONE API call
+			// This batches getUrlDetection + loadState into a single chrome.storage.local.get()
+			const { mode, state } = await loadAll();
+			if (mode === "noUrls") return;
 
 			const match = matchZendeskUrl(details.url);
 			if (!match) return;
 
 			// For ticketUrls mode, only intercept ticket routes
-			if (detection === "ticketUrls" && match.type !== "ticket") return;
+			if (mode === "ticketUrls" && match.type !== "ticket") return;
 
-			await handleNavigation(details.tabId, details.url, match);
+			await handleNavigation(details.tabId, details.url, match, state);
 		},
 		{ url: [{ hostSuffix: "zendesk.com" }] },
 	);
@@ -389,16 +400,17 @@ export default defineBackground(() => {
 			// Deduplication: Skip if we recently processed this exact navigation
 			if (isDuplicateNavigation(details.tabId, details.url)) return;
 
-			const detection = await getUrlDetection();
-			if (detection === "noUrls") return;
+			// PERFORMANCE: Load ALL storage data in ONE API call
+			const { mode, state } = await loadAll();
+			if (mode === "noUrls") return;
 
 			const match = matchZendeskUrl(details.url);
 			if (!match) return;
 
 			// For ticketUrls mode, only intercept ticket routes
-			if (detection === "ticketUrls" && match.type !== "ticket") return;
+			if (mode === "ticketUrls" && match.type !== "ticket") return;
 
-			await handleNavigation(details.tabId, details.url, match);
+			await handleNavigation(details.tabId, details.url, match, state);
 		},
 		{ url: [{ hostSuffix: "zendesk.com" }] },
 	);
@@ -410,20 +422,25 @@ export default defineBackground(() => {
 	 * OPTIMIZATION: Only updates the SINGLE tab's icon instead of all tabs.
 	 * This is critical for performance when DLP extensions (like Incydr) are
 	 * monitoring chrome.* API calls - reduces O(N) to O(1) API calls per navigation.
+	 *
+	 * PERFORMANCE: Uses loadAll() to batch storage reads into single API call.
 	 */
 	chrome.webNavigation.onDOMContentLoaded.addListener(
 		async (details) => {
 			// Only handle main frame
 			if (details.frameId !== 0) return;
 
-			// Track this tab
-			await trackTab(details.tabId, details.url);
+			// PERFORMANCE: Load ALL storage data in ONE API call
+			// This replaces: trackTab() + getUrlDetection() which was 3 separate reads
+			const { mode, state } = await loadAll();
+
+			// Track this tab (using pre-loaded state)
+			await trackTabWithState(details.tabId, details.url, state);
 
 			// Enable action icon for this tab
 			chrome.action.enable(details.tabId);
 
 			// Set icon state for THIS tab only (not all tabs)
-			const mode = await getUrlDetection();
 			await setTabIcon(details.tabId, mode);
 		},
 		{ url: [{ urlContains: "zendesk.com/agent" }] },

src/utils/storage.test.ts

@@ -10,7 +10,14 @@
 
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import { fakeBrowser } from "wxt/testing/fake-browser";
-import { clearState, getUrlDetection, loadState, saveState, setUrlDetection } from "./storage";
+import {
+	clearState,
+	getUrlDetection,
+	loadAll,
+	loadState,
+	saveState,
+	setUrlDetection,
+} from "./storage";
 
 describe("storage", () => {
 	// Reset is handled globally in vitest.setup.ts, but explicit reset ensures isolation
@@ -166,6 +173,72 @@ describe("storage", () => {
 		});
 	});
 
+	describe("loadAll", () => {
+		it("returns both mode and state in a single call", async () => {
+			// Set up both values in storage
+			await fakeBrowser.storage.local.set({
+				urlDetection: "ticketUrls",
+				quicktab_state: {
+					zendeskTabs: { 1: { subdomain: "test", lastActive: 123 } },
+				},
+			});
+
+			const result = await loadAll();
+
+			expect(result.mode).toBe("ticketUrls");
+			expect(result.state).toEqual({
+				zendeskTabs: { 1: { subdomain: "test", lastActive: 123 } },
+			});
+		});
+
+		it("returns defaults when storage is empty", async () => {
+			const result = await loadAll();
+
+			expect(result.mode).toBe("allUrls");
+			expect(result.state).toEqual({ zendeskTabs: {} });
+		});
+
+		it("returns partial defaults when only mode is set", async () => {
+			await fakeBrowser.storage.local.set({ urlDetection: "noUrls" });
+
+			const result = await loadAll();
+
+			expect(result.mode).toBe("noUrls");
+			expect(result.state).toEqual({ zendeskTabs: {} });
+		});
+
+		it("returns partial defaults when only state is set", async () => {
+			await fakeBrowser.storage.local.set({
+				quicktab_state: {
+					zendeskTabs: { 5: { subdomain: "acme", lastActive: 500 } },
+				},
+			});
+
+			const result = await loadAll();
+
+			expect(result.mode).toBe("allUrls");
+			expect(result.state).toEqual({
+				zendeskTabs: { 5: { subdomain: "acme", lastActive: 500 } },
+			});
+		});
+
+		it("returns defaults on storage error (silent fallback)", async () => {
+			vi.spyOn(chrome.storage.local, "get").mockRejectedValueOnce(new Error("Storage error"));
+			const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+
+			const result = await loadAll();
+
+			expect(result.mode).toBe("allUrls");
+			expect(result.state).toEqual({ zendeskTabs: {} });
+			expect(warnSpy).toHaveBeenCalledWith(
+				"QuickTab: Storage read failed, using defaults",
+				expect.any(Error),
+			);
+
+			warnSpy.mockRestore();
+		});
+	});
+
 	describe("clearState", () => {
 		it("removes quicktab_state from storage", async () => {
 			// Set some state first

src/utils/storage.ts

@@ -85,5 +85,40 @@ export async function clearState(): Promise<void> {
 	}
 }
 
+/**
+ * Result of loading all storage data in a single call.
+ * Used to minimize chrome.storage API calls which can be slow
+ * when DLP extensions (like Incydr) are monitoring API usage.
+ */
+export interface AllStorageData {
+	mode: UrlDetectionMode;
+	state: StorageSchema["quicktab_state"];
+}
+
+/**
+ * Load ALL QuickTab data in a SINGLE chrome.storage.local.get() call.
+ *
+ * PERFORMANCE CRITICAL: This batches what would be 2 separate API calls
+ * (getUrlDetection + loadState) into 1 call. When DLP extensions add latency
+ * to each chrome.* API call, this batching is essential for responsiveness.
+ *
+ * @returns Object containing both mode and state
+ */
+export async function loadAll(): Promise<AllStorageData> {
+	try {
+		const result = await chrome.storage.local.get(["urlDetection", STORAGE_KEY]);
+		return {
+			mode: (result.urlDetection as UrlDetectionMode) ?? "allUrls",
+			state: (result[STORAGE_KEY] as StorageSchema["quicktab_state"]) ?? DEFAULT_STATE,
+		};
+	} catch (error) {
+		console.warn("QuickTab: Storage read failed, using defaults", error);
+		return {
+			mode: "allUrls",
+			state: DEFAULT_STATE,
+		};
+	}
+}
+
 // Re-export types for convenience
 export type { ZendeskTabInfo, UrlDetectionMode, StorageSchema };