diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f9198d5..979132a 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -31,6 +31,7 @@
         <activity
             android:name=".BrowserActivity"
             android:hardwareAccelerated="true"
+            android:launchMode="singleTask"
             android:configChanges="orientation|screenSize|keyboardHidden"
             android:exported="true"
             android:label="@string/app_name"
diff --git a/app/src/main/java/com/tv/browser/BrowserActivity.kt b/app/src/main/java/com/tv/browser/BrowserActivity.kt
index 1bfd61a..8078dfa 100644
--- a/app/src/main/java/com/tv/browser/BrowserActivity.kt
+++ b/app/src/main/java/com/tv/browser/BrowserActivity.kt
@@ -339,6 +339,8 @@ class BrowserActivity : AppCompatActivity(), RemoteControlCallback {
                     Log.d("TVBrowser.Filter", "Blocked script: $reqUrl")
                     return ContentFilterHelper.createEmptyScriptResponse()
                 }
+                // 1.3 兼容旧版 WebView：拦截并替换含高版本语法（如 ES2021 `??=`）而导致播放器崩溃的插件脚本
+                VideoSnifferHelper.createCompatScriptResponse(reqUrl)?.let { return it }
                 // 2. 视频流嗅探拦截（.m3u8, .mp4 等）
                 if (VideoSnifferHelper.isVideoStreamUrl(reqUrl)) {
                     onVideoSniffed(reqUrl, currentPageTitle, "net")
@@ -378,6 +380,8 @@ class BrowserActivity : AppCompatActivity(), RemoteControlCallback {
 
             override fun onPageCommitVisible(view: WebView?, url: String?) {
                 super.onPageCommitVisible(view, url)
+                // 新文档 window 刚提交时立即注入嗅探 Hook（onPageStarted 时新 window 可能尚未提交）
+                if (!hasDocStartHook) view?.evaluateJavascript(VideoSnifferHelper.JS_DOCUMENT_START_HOOK, null)
                 injectDesktopModeFallback(view)
                 // 新页面首帧可见时再注入一次，尽量在广告图显示前隐藏
                 if (contentFilterActive) view?.evaluateJavascript(ContentFilterHelper.JS_CONTENT_FILTER, null)
@@ -448,6 +452,7 @@ class BrowserActivity : AppCompatActivity(), RemoteControlCallback {
         webView.webChromeClient = object : WebChromeClient() {
             override fun onProgressChanged(view: WebView?, newProgress: Int) {
                 progressBar.progress = newProgress
+                if (!hasDocStartHook) view?.evaluateJavascript(VideoSnifferHelper.JS_DOCUMENT_START_HOOK, null)
                 if (newProgress >= 100) progressBar.visibility = View.GONE
             }
 
@@ -586,6 +591,14 @@ class BrowserActivity : AppCompatActivity(), RemoteControlCallback {
         }
     }
 
+    override fun onNewIntent(intent: Intent?) {
+        super.onNewIntent(intent)
+        setIntent(intent)
+        if (intent?.action == Intent.ACTION_VIEW && intent.data != null && ::webView.isInitialized) {
+            loadUrl(intent.data!!.toString())
+        }
+    }
+
     /** 是否为 Android TV 设备 */
     private fun isTelevisionDevice(): Boolean {
         val uiModeManager = getSystemService(Context.UI_MODE_SERVICE) as? android.app.UiModeManager
diff --git a/app/src/main/java/com/tv/browser/TVBrowserApplication.kt b/app/src/main/java/com/tv/browser/TVBrowserApplication.kt
index 3a5b7d6..93f8f82 100644
--- a/app/src/main/java/com/tv/browser/TVBrowserApplication.kt
+++ b/app/src/main/java/com/tv/browser/TVBrowserApplication.kt
@@ -38,7 +38,7 @@ class TVBrowserApplication : Application() {
         val dateFormat = SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", Locale.US)
         val fileName = "crash_${dateFormat.format(Date())}.txt"
         val file = File(dir, fileName)
-        FileWriter(file, Charsets.UTF_8).use { writer ->
+        file.bufferedWriter(Charsets.UTF_8).use { writer ->
             val pw = PrintWriter(writer)
             pw.println("=== 崩溃日志 ${SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault()).format(Date())} ===")
             pw.println()
diff --git a/app/src/main/java/com/tv/browser/VideoResolver.kt b/app/src/main/java/com/tv/browser/VideoResolver.kt
index d3ad639..f71e777 100644
--- a/app/src/main/java/com/tv/browser/VideoResolver.kt
+++ b/app/src/main/java/com/tv/browser/VideoResolver.kt
@@ -10,6 +10,7 @@ import android.util.Log
 import android.view.ViewGroup
 import android.webkit.JavascriptInterface
 import android.webkit.SslErrorHandler
+import android.webkit.WebChromeClient
 import android.webkit.WebResourceRequest
 import android.webkit.WebResourceResponse
 import android.webkit.WebSettings
@@ -120,6 +121,7 @@ class VideoResolver(
                 if (AdBlockHelper.isEnabled(context) && AdBlockHelper.shouldBlockUrl(url)) {
                     return AdBlockHelper.createEmptyResponse()
                 }
+                VideoSnifferHelper.createCompatScriptResponse(url)?.let { return it }
                 if (VideoSnifferHelper.isVideoStreamUrl(url)) {
                     handler.post { onCandidate(gen, url, "net", null, "") }
                 }
@@ -134,6 +136,10 @@ class VideoResolver(
                 if (!hasDocStartHook) view?.evaluateJavascript(VideoSnifferHelper.JS_DOCUMENT_START_HOOK, null)
             }
 
+            override fun onPageCommitVisible(view: WebView?, url: String?) {
+                if (!hasDocStartHook) view?.evaluateJavascript(VideoSnifferHelper.JS_DOCUMENT_START_HOOK, null)
+            }
+
             override fun onPageFinished(view: WebView?, url: String?) {
                 if (!hasDocStartHook) view?.evaluateJavascript(VideoSnifferHelper.JS_DOCUMENT_START_HOOK, null)
                 view?.evaluateJavascript(VideoSnifferHelper.JS_SITE_ADAPTER_MACCMS, null)
@@ -144,6 +150,11 @@ class VideoResolver(
                 handler?.proceed() // 与浏览器主界面一致：电视系统时间不准时放行
             }
         }
+        wv.webChromeClient = object : WebChromeClient() {
+            override fun onProgressChanged(view: WebView?, newProgress: Int) {
+                if (!hasDocStartHook) view?.evaluateJavascript(VideoSnifferHelper.JS_DOCUMENT_START_HOOK, null)
+            }
+        }
         // 1x1 挂到窗口上：部分内核对未挂载的 WebView 会暂停计时器，导致播放器脚本不执行
         container.addView(wv, FrameLayout.LayoutParams(1, 1))
         return wv
diff --git a/app/src/main/java/com/tv/browser/VideoSnifferHelper.kt b/app/src/main/java/com/tv/browser/VideoSnifferHelper.kt
index cc8f3c2..e75e6f0 100644
--- a/app/src/main/java/com/tv/browser/VideoSnifferHelper.kt
+++ b/app/src/main/java/com/tv/browser/VideoSnifferHelper.kt
@@ -78,6 +78,27 @@ object VideoSnifferHelper {
     fun createRejectedResponse(): WebResourceResponse =
         WebResourceResponse("text/plain", "utf-8", 403, "Blocked", emptyMap(), ByteArrayInputStream(ByteArray(0)))
 
+    /**
+     * 针对旧版系统 WebView（Chromium < 85，不支持 `??=` / `||=` 等 ES2021 语法）的播放器插件兼容替换：
+     * 例如 4K影视（4kvm.tv）引入的 `artplayer-plugin-danmaku*.js` 含有 `??=`，在电视旧版 WebView 中会报
+     * `Uncaught SyntaxError: Unexpected token '='`，进而导致主脚本调用 `artplayerPluginDanmaku(...)` 时抛
+     * `ReferenceError: artplayerPluginDanmaku is not defined`，在创建 Artplayer / hls.js 前直接中断。
+     * 返回无语法兼容问题且免除弹幕 DOM 开销的同名空插件，确保播放器与 m3u8 加载正常执行。
+     */
+    private const val JS_DANMAKU_COMPAT_STUB =
+        "window.artplayerPluginDanmaku=function(){return function(){var n=function(){};return{name:'artplayerPluginDanmaku',send:n,load:n,clear:n,toggle:n,setOpacity:n,destroy:n,push:n,manager:null,container:null}}};"
+
+    fun createCompatScriptResponse(url: String): WebResourceResponse? {
+        if (url.contains("artplayer-plugin-danmaku", ignoreCase = true)) {
+            return WebResourceResponse(
+                "application/javascript",
+                "utf-8",
+                ByteArrayInputStream(JS_DANMAKU_COMPAT_STUB.toByteArray(Charsets.UTF_8))
+            )
+        }
+        return null
+    }
+
     /** 原生播放器无法播放时给用户的提示 */
     const val WEB_ONLY_MESSAGE = "央视网视频经过加密，原生播放器会花屏，请直接在网页中播放"
 
@@ -212,6 +233,14 @@ object VideoSnifferHelper {
      */
     val JS_DOCUMENT_START_HOOK = """
         (function() {
+            if (typeof window.artplayerPluginDanmaku !== 'function') {
+                window.artplayerPluginDanmaku = function() {
+                    return function() {
+                        var n = function() {};
+                        return { name: 'artplayerPluginDanmaku', send: n, load: n, clear: n, toggle: n, setOpacity: n, destroy: n, push: n, manager: null, container: null };
+                    };
+                };
+            }
             if (window.__tvSniffInstalled) return;
             window.__tvSniffInstalled = true;
             var reported = {};