diff --git a/apps/browser-extension/entrypoints/background.ts b/apps/browser-extension/entrypoints/background.ts
index f9f9c979..52e05754 100644
--- a/apps/browser-extension/entrypoints/background.ts
+++ b/apps/browser-extension/entrypoints/background.ts
@@ -21,6 +21,45 @@ import type {
 	MemoryPayload,
 } from "../utils/types"
 
+const PLATFORM_LABELS: Record<string, string> = {
+	chatgpt: "ChatGPT",
+	claude: "Claude",
+	gemini: "Gemini",
+	t3: "T3 Chat",
+	twitter: "X / Twitter",
+}
+
+function normalizePlatform(value?: string): string | undefined {
+	if (!value) return undefined
+	return value.toLowerCase().replace(/[^a-z0-9]+/g, "_").replace(/^_+|_+$/g, "")
+}
+
+function inferPlatformFromActionSource(actionSource: string): string | undefined {
+	const source = actionSource.toLowerCase()
+	if (source.includes("chatgpt")) return "chatgpt"
+	if (source.includes("claude")) return "claude"
+	if (source.includes("gemini")) return "gemini"
+	if (source.includes("t3")) return "t3"
+	if (source.includes("twitter") || source.includes("x_")) return "twitter"
+	return undefined
+}
+
+function inferPlatformFromUrl(url?: string): string | undefined {
+	if (!url) return undefined
+	try {
+		const hostname = new URL(url).hostname
+		if (hostname === "chatgpt.com" || hostname === "chat.openai.com") {
+			return "chatgpt"
+		}
+		if (hostname === "claude.ai") return "claude"
+		if (hostname === "gemini.google.com") return "gemini"
+		if (hostname === "t3.chat") return "t3"
+		if (hostname === "x.com" || hostname === "twitter.com") return "twitter"
+	} catch {
+		return undefined
+	}
+}
+
 export default defineBackground(() => {
 	let twitterImporter: TwitterImporter | null = null
 
@@ -107,11 +146,32 @@ export default defineBackground(() => {
 				content = data?.url || ""
 			}
 
+			const platform = normalizePlatform(data.sourcePlatform)
+				|| inferPlatformFromUrl(data.url)
+				|| inferPlatformFromActionSource(actionSource)
+			const platformLabel = platform
+				? data.sourcePlatformLabel || PLATFORM_LABELS[platform] || platform
+				: undefined
+
 			const metadata: MemoryPayload["metadata"] = {
 				sm_source: "consumer",
+				sm_origin: "browser_extension",
+				sm_origin_action: actionSource,
 				website_url: data.url,
 			}
 
+			if (platform) {
+				metadata.sm_origin_platform = platform
+			}
+
+			if (platformLabel) {
+				metadata.sm_origin_platform_label = platformLabel
+			}
+
+			if (data.sourceSurface) {
+				metadata.sm_origin_surface = data.sourceSurface
+			}
+
 			if (data.ogImage) {
 				metadata.website_og_image = data.ogImage
 			}
@@ -252,6 +312,9 @@ export default defineBackground(() => {
 
 						const memoryData: MemoryData = {
 							content: messageData.prompt,
+							url: messageData.source,
+							sourcePlatform: messageData.platform,
+							sourceSurface: "prompt_capture",
 						}
 
 						const result = await saveMemoryToSupermemory(
diff --git a/apps/browser-extension/entrypoints/content/chatgpt.ts b/apps/browser-extension/entrypoints/content/chatgpt.ts
index d6049cab..0ec50d92 100644
--- a/apps/browser-extension/entrypoints/content/chatgpt.ts
+++ b/apps/browser-extension/entrypoints/content/chatgpt.ts
@@ -341,6 +341,9 @@ async function saveMemoriesToSupermemory() {
 			action: MESSAGE_TYPES.SAVE_MEMORY,
 			data: {
 				html: combinedContent,
+				sourcePlatform: "chatgpt",
+				sourceSurface: "memories_dialog",
+				url: window.location.href,
 			},
 			actionSource: "chatgpt_memories_dialog",
 		})
@@ -701,7 +704,7 @@ function setupChatGPTPromptCapture() {
 					data: {
 						prompt: promptContent,
 						platform: "chatgpt",
-						source: source,
+						source: window.location.href,
 					},
 				})
 			} catch (error) {
diff --git a/apps/browser-extension/entrypoints/content/claude.ts b/apps/browser-extension/entrypoints/content/claude.ts
index 5bd0d6e1..54c5ceb4 100644
--- a/apps/browser-extension/entrypoints/content/claude.ts
+++ b/apps/browser-extension/entrypoints/content/claude.ts
@@ -749,7 +749,7 @@ function setupClaudePromptCapture() {
 					data: {
 						prompt: promptContent,
 						platform: "claude",
-						source: source,
+						source: window.location.href,
 					},
 				})
 			} catch (error) {
diff --git a/apps/browser-extension/entrypoints/content/gemini.ts b/apps/browser-extension/entrypoints/content/gemini.ts
index 04c670a2..cf763c10 100644
--- a/apps/browser-extension/entrypoints/content/gemini.ts
+++ b/apps/browser-extension/entrypoints/content/gemini.ts
@@ -523,7 +523,7 @@ function setupGeminiPromptCapture() {
 					data: {
 						prompt: promptContent,
 						platform: "gemini",
-						source,
+						source: window.location.href,
 					},
 				})
 				debugGemini("capture response", response)
diff --git a/apps/browser-extension/entrypoints/content/t3.ts b/apps/browser-extension/entrypoints/content/t3.ts
index c7bdb09a..13ce233d 100644
--- a/apps/browser-extension/entrypoints/content/t3.ts
+++ b/apps/browser-extension/entrypoints/content/t3.ts
@@ -546,7 +546,7 @@ function setupT3PromptCapture() {
 					data: {
 						prompt: promptContent,
 						platform: "t3",
-						source: source,
+						source: window.location.href,
 					},
 				})
 			} catch (error) {
diff --git a/apps/browser-extension/utils/types.ts b/apps/browser-extension/utils/types.ts
index 8cec2241..e17f4ff9 100644
--- a/apps/browser-extension/utils/types.ts
+++ b/apps/browser-extension/utils/types.ts
@@ -38,6 +38,9 @@ export interface MemoryData {
 	url?: string
 	ogImage?: string
 	title?: string
+	sourcePlatform?: string
+	sourcePlatformLabel?: string
+	sourceSurface?: string
 }
 
 /**
diff --git a/apps/web/components/memories-grid.tsx b/apps/web/components/memories-grid.tsx
index be363274..f8098148 100644
--- a/apps/web/components/memories-grid.tsx
+++ b/apps/web/components/memories-grid.tsx
@@ -101,6 +101,32 @@ type OgData = {
 	image?: string
 }
 
+const EXTENSION_PLATFORM_LABELS: Record<string, string> = {
+	chatgpt: "ChatGPT",
+	claude: "Claude",
+	gemini: "Gemini",
+	t3: "T3 Chat",
+	twitter: "X / Twitter",
+}
+
+function getExtensionSourceLabel(document: DocumentWithMemories): string | null {
+	const metadata = document.metadata
+	if (!metadata || typeof metadata !== "object") return null
+
+	const label = metadata.sm_origin_platform_label
+	if (typeof label === "string" && label.trim()) {
+		return label.trim()
+	}
+
+	const platform = metadata.sm_origin_platform
+	if (typeof platform === "string" && platform.trim()) {
+		const normalized = platform.trim().toLowerCase()
+		return EXTENSION_PLATFORM_LABELS[normalized] || platform.trim()
+	}
+
+	return null
+}
+
 const ogCache = new Map<string, OgData>()
 const ogInflight = new Map<string, Promise<OgData | null>>()
 const ogFailures = new Map<string, number>()
@@ -1229,6 +1255,7 @@ const DocumentCard = memo(
 											pluginDocument?.kind === "claude-code-doc"
 												? claudeCodeTokenBadge(document)
 												: null
+										const sourceLabel = getExtensionSourceLabel(document)
 										const date = new Date(
 											document.createdAt,
 										).toLocaleDateString("en-US", {
@@ -1236,7 +1263,7 @@ const DocumentCard = memo(
 											day: "numeric",
 											year: "numeric",
 										})
-										return badge ? `${badge} · ${date}` : date
+										return [sourceLabel, badge, date].filter(Boolean).join(" - ")
 									})()}
 								</p>
 							</div>