diff --git a/packages/extension/src/components/HistoryList.tsx b/packages/extension/src/components/HistoryList.tsx
index 176633b..4597d83 100644
--- a/packages/extension/src/components/HistoryList.tsx
+++ b/packages/extension/src/components/HistoryList.tsx
@@ -1,8 +1,9 @@
-import { ArrowLeft, CheckCircle, RotateCcw, Trash2, XCircle } from 'lucide-react'
+import { ArrowDownToLine, ArrowLeft, CheckCircle, RotateCcw, Trash2, XCircle } from 'lucide-react'
 import { useCallback, useEffect, useState } from 'react'
 
 import { Button } from '@/components/ui/button'
 import { type SessionRecord, clearSessions, deleteSession, listSessions } from '@/lib/db'
+import { downloadHistoryExport } from '@/lib/history-export'
 
 function timeAgo(ts: number): string {
 	const seconds = Math.floor((Date.now() - ts) / 1000)
@@ -43,6 +44,11 @@ export function HistoryList({
 		setSessions((prev) => prev.filter((s) => s.id !== id))
 	}
 
+	const handleExport = (e: React.MouseEvent, session: SessionRecord) => {
+		e.stopPropagation()
+		downloadHistoryExport(session.task, session.createdAt, session.history)
+	}
+
 	const handleRerun = (e: React.MouseEvent, task: string) => {
 		e.stopPropagation()
 		onRerun(task)
@@ -124,6 +130,15 @@ export function HistoryList({
 									>
 										<RotateCcw className="size-3" />
 									</button>
+									<button
+										type="button"
+										onClick={(e) => handleExport(e, session)}
+										className="p-1 text-muted-foreground hover:text-foreground transition-colors cursor-pointer"
+										title="Export history JSON"
+										aria-label={`Export history for ${session.task}`}
+									>
+										<ArrowDownToLine className="size-3" />
+									</button>
 									<button
 										type="button"
 										onClick={(e) => handleDelete(e, session.id)}
diff --git a/packages/extension/src/lib/history-export.ts b/packages/extension/src/lib/history-export.ts
new file mode 100644
index 0000000..83e6ab5
--- /dev/null
+++ b/packages/extension/src/lib/history-export.ts
@@ -0,0 +1,60 @@
+import type { HistoricalEvent } from '@page-agent/core'
+
+const EXPORT_FILE_PREFIX = 'page-agent-history'
+const MAX_TASK_SLUG_LENGTH = 40
+
+export function serializeHistoryExport(history: HistoricalEvent[]): string {
+	return `${JSON.stringify(history, null, 2)}\n`
+}
+
+export function buildHistoryExportFilename(task: string, createdAt: number): string {
+	const taskSlug = sanitizeTaskForFilename(task)
+	const timestamp = formatTimestampForFilename(createdAt)
+
+	return taskSlug
+		? `${EXPORT_FILE_PREFIX}-${taskSlug}-${timestamp}.json`
+		: `${EXPORT_FILE_PREFIX}-${timestamp}.json`
+}
+
+export function downloadHistoryExport(
+	task: string,
+	createdAt: number,
+	history: HistoricalEvent[]
+): void {
+	const filename = buildHistoryExportFilename(task, createdAt)
+	const content = serializeHistoryExport(history)
+	const blob = new Blob([content], { type: 'application/json;charset=utf-8' })
+	const url = URL.createObjectURL(blob)
+	const link = document.createElement('a')
+
+	link.href = url
+	link.download = filename
+	link.click()
+
+	URL.revokeObjectURL(url)
+}
+
+function sanitizeTaskForFilename(task: string): string {
+	return task
+		.trim()
+		.toLowerCase()
+		.replace(/[^a-z0-9]+/g, '-')
+		.replace(/^-+|-+$/g, '')
+		.slice(0, MAX_TASK_SLUG_LENGTH)
+}
+
+function formatTimestampForFilename(createdAt: number): string {
+	const date = new Date(createdAt)
+	const year = date.getFullYear()
+	const month = pad(date.getMonth() + 1)
+	const day = pad(date.getDate())
+	const hours = pad(date.getHours())
+	const minutes = pad(date.getMinutes())
+	const seconds = pad(date.getSeconds())
+
+	return `${year}-${month}-${day}_${hours}-${minutes}-${seconds}`
+}
+
+function pad(value: number): string {
+	return value.toString().padStart(2, '0')
+}