diff --git a/packages/extension/src/entrypoints/background.ts b/packages/extension/src/entrypoints/background.ts
index 25cfb8a..76bf2f0 100644
--- a/packages/extension/src/entrypoints/background.ts
+++ b/packages/extension/src/entrypoints/background.ts
@@ -244,5 +244,16 @@ function registerContentScriptHandlers(): void {
 		return shouldShow
 	})
 
+	// Handle content script errors - broadcast to sidepanel for user visibility
+	contentScriptQuery.onMessage('content:error', async ({ data }) => {
+		console.error('[PageAgentExt] Content script error:', data.message, 'on', data.url)
+		// Broadcast error to sidepanel
+		const errorEvent: HistoricalEvent = {
+			type: 'error',
+			message: `Content script error on ${data.url}: ${data.message}`,
+		}
+		eventBroadcaster.history([errorEvent])
+	})
+
 	console.log('[PageAgentExt] Content script handlers registered')
 }
diff --git a/packages/extension/src/entrypoints/content.ts b/packages/extension/src/entrypoints/content.ts
index 6d295f7..e894257 100644
--- a/packages/extension/src/entrypoints/content.ts
+++ b/packages/extension/src/entrypoints/content.ts
@@ -16,15 +16,28 @@ export default defineContentScript({
 	runAt: 'document_idle',
 
 	async main() {
-		console.log('[PageAgentExt] Content script loaded')
+		console.log('[PageAgentExt] Content script loaded on', window.location.href)
 
 		// Lazy-initialized controller - created on demand, disposed between tasks
 		let controller: PageController | null = null
+		let initError: Error | null = null
 
 		function getController(): PageController {
+			// Re-throw init error if controller creation previously failed
+			if (initError) {
+				throw initError
+			}
 			if (!controller) {
-				controller = new PageController({ enableMask: true })
-				console.log('[PageAgentExt] PageController created')
+				try {
+					controller = new PageController({ enableMask: true })
+					console.log('[PageAgentExt] PageController created')
+				} catch (error) {
+					initError = error instanceof Error ? error : new Error(String(error))
+					console.error('[PageAgentExt] Failed to create PageController:', initError)
+					// Report error to background
+					reportError(initError.message)
+					throw initError
+				}
 			}
 			return controller
 		}
@@ -36,6 +49,7 @@ export default defineContentScript({
 			() => {
 				controller?.dispose()
 				controller = null
+				initError = null // Clear error on dispose to allow retry
 				console.log('[PageAgentExt] PageController disposed')
 			}
 		)
@@ -66,6 +80,17 @@ export default defineContentScript({
 	},
 })
 
+/**
+ * Report content script error to background for user visibility
+ */
+function reportError(message: string): void {
+	contentScriptQuery
+		.sendMessage('content:error', { message, url: window.location.href })
+		.catch(() => {
+			// Silently ignore if background is not available
+		})
+}
+
 /**
  * Register all RPC message handlers for PageController methods
  */
diff --git a/packages/extension/src/messaging/protocol.ts b/packages/extension/src/messaging/protocol.ts
index 721a330..a6b1fd8 100644
--- a/packages/extension/src/messaging/protocol.ts
+++ b/packages/extension/src/messaging/protocol.ts
@@ -140,6 +140,8 @@ export interface AgentCommandProtocol {
 export interface ContentScriptQueryProtocol {
 	/** Check if there's an active task for this tab, returns true if mask should be shown */
 	'content:shouldShowMask': () => boolean
+	/** Report content script initialization error to background */
+	'content:error': (error: { message: string; url: string }) => void
 }
 
 // ============================================================================
diff --git a/packages/extension/wxt.config.js b/packages/extension/wxt.config.js
index 93c568a..cce9717 100644
--- a/packages/extension/wxt.config.js
+++ b/packages/extension/wxt.config.js
@@ -40,11 +40,5 @@ export default defineConfig({
 		side_panel: {
 			default_path: 'sidepanel/index.html',
 		},
-		web_accessible_resources: [
-			{
-				resources: ['main-world.js'],
-				matches: ['<all_urls>'],
-			},
-		],
 	},
 })