diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActMediaViewer.kt b/app/src/main/java/jp/juggler/subwaytooter/ActMediaViewer.kt
index 80e4d7bf..043d7d8f 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActMediaViewer.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActMediaViewer.kt
@@ -33,6 +33,7 @@ import jp.juggler.subwaytooter.api.entity.TootAttachment.Companion.tootAttachmen
 import jp.juggler.subwaytooter.databinding.ActMediaViewerBinding
 import jp.juggler.subwaytooter.dialog.actionsDialog
 import jp.juggler.subwaytooter.drawable.MediaBackgroundDrawable
+import jp.juggler.subwaytooter.itemviewholder.reUrlGif
 import jp.juggler.subwaytooter.pref.PrefI
 import jp.juggler.subwaytooter.util.permissionSpecMediaDownload
 import jp.juggler.subwaytooter.util.requester
@@ -61,7 +62,7 @@ import javax.microedition.khronos.opengles.GL10
 import javax.net.ssl.HttpsURLConnection
 import kotlin.math.max
 
-@androidx.media3.common.util.UnstableApi
+@androidx.annotation.OptIn(markerClass = [androidx.media3.common.util.UnstableApi::class])
 class ActMediaViewer : AppCompatActivity(), View.OnClickListener {
 
     companion object {
@@ -399,6 +400,17 @@ class ActMediaViewer : AppCompatActivity(), View.OnClickListener {
             setShowNextButton(false)
             setRepeatToggleModes(RepeatModeUtil.REPEAT_TOGGLE_MODE_ONE)
         }
+
+        views.wvOther.apply{
+            scrollBarStyle = View.SCROLLBARS_INSIDE_OVERLAY
+            settings.apply {
+                @SuppressLint("SetJavaScriptEnabled")
+                javaScriptEnabled = true
+                loadWithOverviewMode = true
+                useWideViewPort = true
+                setSupportZoom(true)
+            }
+        }
     }
 
     internal fun loadDelta(delta: Int) {
@@ -414,6 +426,7 @@ class ActMediaViewer : AppCompatActivity(), View.OnClickListener {
 
         // いったんすべて隠す
         views.run {
+            wvOther.gone()
             pbvImage.gone()
             pvVideo.gone()
             tvError.gone()
@@ -434,10 +447,15 @@ class ActMediaViewer : AppCompatActivity(), View.OnClickListener {
 
         when (ta.type) {
             TootAttachmentType.Unknown,
-            -> showError(getString(R.string.media_attachment_type_error, ta.type.id))
+            -> loadOther(ta) // showError(getString(R.string.media_attachment_type_error, ta.type.id))
 
-            TootAttachmentType.Image,
-            -> loadBitmap(ta)
+            TootAttachmentType.Image -> when {
+                reUrlGif.containsMatchIn(ta.remote_url ?: "") ->
+                    loadOther(ta)
+
+                else ->
+                    loadBitmap(ta)
+            }
 
             TootAttachmentType.Video,
             TootAttachmentType.GIFV,
@@ -590,7 +608,21 @@ class ActMediaViewer : AppCompatActivity(), View.OnClickListener {
         return Pair(bitmap2, null)
     }
 
-    @SuppressLint("StaticFieldLeak")
+    private fun loadOther(ta: TootAttachment) {
+
+        val urlList = ta.getLargeUrlList()
+        if (urlList.isEmpty()) {
+            showError("missing media attachment url.")
+            return
+        }
+        val url = urlList.first()
+        views.run {
+            cbMute.gone()
+            tvStatus.visible().text = "${ta.type.id} ${url.ellipsizeDot3(100)}"
+            wvOther.visible().loadUrl(url)
+        }
+    }
+
     private fun loadBitmap(ta: TootAttachment) {
 
         views.run {
diff --git a/app/src/main/java/jp/juggler/subwaytooter/api/entity/TootAttachmentMSP.kt b/app/src/main/java/jp/juggler/subwaytooter/api/entity/TootAttachmentMSP.kt
index 5d0a5fa9..8451f7c6 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/api/entity/TootAttachmentMSP.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/api/entity/TootAttachmentMSP.kt
@@ -7,11 +7,9 @@ class TootAttachmentMSP(
     val preview_url: String,
 ) : TootAttachmentLike {
 
-    override val type: TootAttachmentType
-        get() = TootAttachmentType.Unknown
+    override val type = TootAttachmentType.Unknown
 
-    override val description: String?
-        get() = null
+    override val description = null
 
     override fun urlForThumbnail() = preview_url
 
diff --git a/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderActions.kt b/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderActions.kt
index 2287f707..ab41d4d3 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderActions.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderActions.kt
@@ -5,9 +5,35 @@ import android.view.View
 import jp.juggler.subwaytooter.ActMain
 import jp.juggler.subwaytooter.ActMediaViewer
 import jp.juggler.subwaytooter.R
-import jp.juggler.subwaytooter.action.*
+import jp.juggler.subwaytooter.action.clickCardImage
+import jp.juggler.subwaytooter.action.clickConversation
+import jp.juggler.subwaytooter.action.clickDomainBlock
+import jp.juggler.subwaytooter.action.clickFollowInfo
+import jp.juggler.subwaytooter.action.clickFollowRequestAccept
+import jp.juggler.subwaytooter.action.clickListMoreButton
+import jp.juggler.subwaytooter.action.clickListTl
+import jp.juggler.subwaytooter.action.clickReplyInfo
+import jp.juggler.subwaytooter.action.clickScheduledToot
+import jp.juggler.subwaytooter.action.conversationOtherInstance
+import jp.juggler.subwaytooter.action.followFromAnotherAccount
+import jp.juggler.subwaytooter.action.longClickTootTag
+import jp.juggler.subwaytooter.action.openFilterMenu
+import jp.juggler.subwaytooter.action.tagDialog
+import jp.juggler.subwaytooter.action.userProfileLocal
 import jp.juggler.subwaytooter.actmain.nextPosition
-import jp.juggler.subwaytooter.api.entity.*
+import jp.juggler.subwaytooter.api.entity.ServiceType
+import jp.juggler.subwaytooter.api.entity.TimelineItem
+import jp.juggler.subwaytooter.api.entity.TootAccountRef
+import jp.juggler.subwaytooter.api.entity.TootAttachment
+import jp.juggler.subwaytooter.api.entity.TootAttachmentMSP
+import jp.juggler.subwaytooter.api.entity.TootAttachmentType
+import jp.juggler.subwaytooter.api.entity.TootConversationSummary
+import jp.juggler.subwaytooter.api.entity.TootDomainBlock
+import jp.juggler.subwaytooter.api.entity.TootGap
+import jp.juggler.subwaytooter.api.entity.TootNotification
+import jp.juggler.subwaytooter.api.entity.TootScheduled
+import jp.juggler.subwaytooter.api.entity.TootSearchGap
+import jp.juggler.subwaytooter.api.entity.TootTag
 import jp.juggler.subwaytooter.column.Column
 import jp.juggler.subwaytooter.column.startGap
 import jp.juggler.subwaytooter.pref.PrefB
@@ -62,6 +88,7 @@ fun ItemViewHolder.onClickImpl(v: View?) {
                     tvContent
                 ).show()
             }
+
             btnFollow -> clickFollowInfo(
                 pos,
                 accessInfo,
@@ -88,11 +115,13 @@ fun ItemViewHolder.onClickImpl(v: View?) {
                 followAccount,
                 accept = true
             )
+
             btnFollowRequestDeny -> clickFollowRequestAccept(
                 accessInfo,
                 followAccount,
                 accept = false
             )
+
             llFilter -> openFilterMenu(accessInfo, item.cast())
             ivCardImage -> clickCardImage(pos, accessInfo, statusShowing?.card)
             llConversationIcons -> clickConversation(
@@ -200,7 +229,7 @@ private fun ItemViewHolder.clickMedia(i: Int) {
             statusShowing?.media_attachments ?: (item as? TootScheduled)?.mediaAttachments
             ?: return
 
-        when (val item = if (i < mediaAttachments.size) mediaAttachments[i] else return) {
+        when (val item = mediaAttachments.firstOrNull() ?: return) {
             is TootAttachmentMSP -> {
                 // マストドン検索ポータルのデータではmedia_attachmentsが簡略化されている
                 // 会話の流れを表示する
@@ -212,15 +241,16 @@ private fun ItemViewHolder.clickMedia(i: Int) {
 
             is TootAttachment -> when {
 
-                // unknownが1枚だけなら内蔵ビューアを使わずにインテントを投げる
-                item.type == TootAttachmentType.Unknown && mediaAttachments.size == 1 -> {
-                    // https://github.com/tateisu/SubwayTooter/pull/119
-                    // メディアタイプがunknownの場合、そのほとんどはリモートから来たURLである
-                    // PrefB.bpPriorLocalURL の状態に関わらずリモートURLがあればそれをブラウザで開く
-                    when (val remoteUrl = item.remote_url.notEmpty()) {
-                        null -> activity.openCustomTab(item)
-                        else -> activity.openCustomTab(remoteUrl)
-                    }
+                // 添付メディアが1枚だけで、unknownまたはファイル拡張子がGIFなら、ブラウザで開く
+                // https://github.com/tateisu/SubwayTooter/pull/119
+                // メディアタイプがunknownの場合、そのほとんどはリモートから来たURLである
+                // PrefB.bpPriorLocalURL の状態に関わらずリモートURLがあればそれをブラウザで開く
+                mediaAttachments.size == 1 &&
+                        (item.type == TootAttachmentType.Unknown ||
+                                reUrlGif.containsMatchIn(item.remote_url ?: ""))
+                -> when (val remoteUrl = item.remote_url.notEmpty()) {
+                    null -> activity.openCustomTab(item)
+                    else -> activity.openCustomTab(remoteUrl)
                 }
 
                 // 内蔵メディアビューアを使う
@@ -324,9 +354,11 @@ private fun ItemViewHolder.clickTag(pos: Int, item: TimelineItem?) {
                         item.name,
                         tagInfo = item,
                     )
+
                 TootTag.TagType.Link ->
                     openCustomTab(item.url)
             }
+
             is TootSearchGap -> column.startGap(item, isHead = true)
             is TootConversationSummary -> clickConversation(
                 pos,
@@ -334,6 +366,7 @@ private fun ItemViewHolder.clickTag(pos: Int, item: TimelineItem?) {
                 listAdapter,
                 summary = item
             )
+
             is TootGap -> clickTootGap(column, item)
             is TootDomainBlock -> clickDomainBlock(accessInfo, item)
             is TootScheduled -> clickScheduledToot(accessInfo, item, column)
diff --git a/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderShowStatus.kt b/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderShowStatus.kt
index 751fc7f9..8743ca83 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderShowStatus.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/itemviewholder/ItemViewHolderShowStatus.kt
@@ -356,6 +356,8 @@ private fun ItemViewHolder.showAttachments(status: TootStatus) {
     }
 }
 
+val reUrlGif = """\.gif(?:\z|\?)""".toRegex(RegexOption.IGNORE_CASE)
+
 fun ItemViewHolder.setMedia(
     mediaAttachments: ArrayList<TootAttachmentLike>,
     idx: Int,
@@ -390,11 +392,28 @@ fun ItemViewHolder.setMedia(
         TootAttachmentType.Unknown -> {
             iv.setMediaType(0)
             iv.setDefaultImage(defaultColorIcon(activity, R.drawable.wide_question))
-            iv.setImageUrl(0f, null)
+            if (ta is TootAttachment &&
+                reUrlGif.containsMatchIn(ta.remote_url ?: "") &&
+                PrefB.bpImageAnimationEnable.value
+            ) {
+                val url = ta.remote_url!!
+                iv.setImageUrl(0f, url, url)
+            } else {
+                iv.setImageUrl(0f, null)
+            }
             showUrl = true
         }
 
-        else -> when (val urlThumbnail = ta.urlForThumbnail()) {
+        else -> if (ta is TootAttachment &&
+            reUrlGif.containsMatchIn(ta.remote_url ?: "") &&
+            PrefB.bpImageAnimationEnable.value
+        ) {
+            iv.setMediaType(0)
+            iv.setDefaultImage(null)
+            val url = ta.remote_url!!
+            iv.setImageUrl(0f, url, url)
+            showUrl = false
+        } else when (val urlThumbnail = ta.urlForThumbnail()) {
             null, "" -> {
                 iv.setMediaType(0)
                 iv.setDefaultImage(defaultColorIcon(activity, R.drawable.wide_question))
diff --git a/app/src/main/res/layout/act_media_viewer.xml b/app/src/main/res/layout/act_media_viewer.xml
index 98d60a50..cc12a266 100644
--- a/app/src/main/res/layout/act_media_viewer.xml
+++ b/app/src/main/res/layout/act_media_viewer.xml
@@ -26,6 +26,12 @@
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_weight="1">
+        
+        <WebView
+            android:id="@+id/wvOther"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            />
 
         <jp.juggler.subwaytooter.view.PinchBitmapView
             android:id="@+id/pbvImage"