diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt
index 8dfcb27a40..bfb3381fa0 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt
@@ -71,7 +71,7 @@ class ExtensionManager(
         private set(value) {
             field = value
             availableExtensionsRelay.call(value)
-            setUpdateFieldOfInstalledExtensions(value)
+            updatedInstalledExtensionsStatuses(value)
         }
 
     /**
@@ -158,18 +158,25 @@ class ExtensionManager(
      *
      * @param availableExtensions The list of extensions given by the [api].
      */
-    private fun setUpdateFieldOfInstalledExtensions(availableExtensions: List<Extension.Available>) {
+    private fun updatedInstalledExtensionsStatuses(availableExtensions: List<Extension.Available>) {
         val mutInstalledExtensions = installedExtensions.toMutableList()
         var changed = false
 
         for ((index, installedExt) in mutInstalledExtensions.withIndex()) {
             val pkgName = installedExt.pkgName
-            val availableExt = availableExtensions.find { it.pkgName == pkgName } ?: continue
+            val availableExt = availableExtensions.find { it.pkgName == pkgName }
 
-            val hasUpdate = availableExt.versionCode > installedExt.versionCode
-            if (installedExt.hasUpdate != hasUpdate) {
-                mutInstalledExtensions[index] = installedExt.copy(hasUpdate = hasUpdate)
-                changed = true
+            if (availableExt == null) {
+                if (!installedExt.isObsolete) {
+                    mutInstalledExtensions[index] = installedExt.copy(isObsolete = true)
+                    changed = true
+                }
+            } else {
+                val hasUpdate = availableExt.versionCode > installedExt.versionCode
+                if (installedExt.hasUpdate != hasUpdate) {
+                    mutInstalledExtensions[index] = installedExt.copy(hasUpdate = hasUpdate)
+                    changed = true
+                }
             }
         }
         if (changed) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt
index ef4c245684..f0a53690f5 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt
@@ -16,7 +16,8 @@ sealed class Extension {
                          override val versionCode: Int,
                          val sources: List<Source>,
                          override val lang: String,
-                         val hasUpdate: Boolean = false) : Extension()
+                         val hasUpdate: Boolean = false,
+                         val isObsolete: Boolean = false) : Extension()
 
     data class Available(override val name: String,
                          override val pkgName: String,
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt
index 9d020e278a..73afc46810 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt
@@ -69,6 +69,10 @@ class ExtensionDetailsController(bundle: Bundle? = null) :
             presenter.uninstallExtension()
         }
 
+        if (extension.isObsolete) {
+            extension_obsolete.visibility = View.VISIBLE
+        }
+
         val themedContext by lazy { getPreferenceThemeContext() }
         val manager = PreferenceManager(themedContext)
         manager.preferenceDataStore = EmptyPreferenceDataStore()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionHolder.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionHolder.kt
index bcf6b3a131..a1425da46b 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionHolder.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionHolder.kt
@@ -1,6 +1,8 @@
 package eu.kanade.tachiyomi.ui.extension
 
 import android.view.View
+import androidx.core.content.ContextCompat
+import androidx.vectordrawable.graphics.drawable.VectorDrawableCompat
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.glide.GlideApp
 import eu.kanade.tachiyomi.extension.model.Extension
@@ -52,11 +54,15 @@ class ExtensionHolder(view: View, override val adapter: ExtensionAdapter) :
         bindButton(item)
     }
 
+    @Suppress("ResourceType")
     fun bindButton(item: ExtensionItem) = with(ext_button) {
         isEnabled = true
         isClickable = true
         isActivated = false
 
+        background = VectorDrawableCompat.create(resources!!, R.drawable.button_bg_transparent, null)
+        setTextColor(ContextCompat.getColorStateList(context, R.drawable.button_bg_transparent))
+
         val extension = item.extension
 
         val installStep = item.installStep
@@ -73,11 +79,21 @@ class ExtensionHolder(view: View, override val adapter: ExtensionAdapter) :
                 isClickable = false
             }
         } else if (extension is Extension.Installed) {
-            if (extension.hasUpdate) {
-                isActivated = true
-                setText(R.string.ext_update)
-            } else {
-                setText(R.string.ext_details)
+            when {
+                extension.hasUpdate -> {
+                    isActivated = true
+                    setText(R.string.ext_update)
+                }
+                extension.isObsolete -> {
+                    // Red outline
+                    background = VectorDrawableCompat.create(resources, R.drawable.button_bg_error, null)
+                    setTextColor(ContextCompat.getColorStateList(context, R.drawable.button_bg_error))
+
+                    setText(R.string.ext_obsolete)
+                }
+                else -> {
+                    setText(R.string.ext_details)
+                }
             }
         } else if (extension is Extension.Untrusted) {
             setText(R.string.ext_trust)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionPresenter.kt
index fda29d66e8..97997b55f1 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionPresenter.kt
@@ -62,7 +62,7 @@ open class ExtensionPresenter(
 
         val items = mutableListOf<ExtensionItem>()
 
-        val installedSorted = installed.sortedWith(compareBy({ !it.hasUpdate }, { it.pkgName }))
+        val installedSorted = installed.sortedWith(compareBy({ !it.hasUpdate }, { !it.isObsolete }, { it.pkgName }))
         val untrustedSorted = untrusted.sortedBy { it.pkgName }
         val availableSorted = available
                 // Filter out already installed extensions and disabled languages
diff --git a/app/src/main/res/drawable/button_bg_error.xml b/app/src/main/res/drawable/button_bg_error.xml
new file mode 100644
index 0000000000..3edb3611bb
--- /dev/null
+++ b/app/src/main/res/drawable/button_bg_error.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_activated="true" android:color="@color/md_white_1000">
+        <shape android:shape="rectangle">
+            <corners android:radius="2dp" />
+            <solid android:color="@color/red_error" />
+            <padding android:left="8dp" android:right="8dp" />
+        </shape>
+    </item>
+    <item android:state_enabled="false" android:color="@color/textColorHintLight">
+        <shape android:shape="rectangle">
+            <corners android:radius="2dp" />
+            <solid android:color="@android:color/transparent" />
+            <stroke android:width="1dp" android:color="@color/textColorHintLight" />
+            <padding android:left="8dp" android:right="8dp" />
+        </shape>
+    </item>
+    <item android:color="@color/red_error">
+        <shape android:color="@color/red_error" android:shape="rectangle">
+            <corners android:radius="2dp" />
+            <solid android:color="@android:color/transparent" />
+            <stroke android:width="1dp" android:color="@color/red_error" />
+            <padding android:left="8dp" android:right="8dp" />
+        </shape>
+    </item>
+</selector>
diff --git a/app/src/main/res/layout/extension_detail_controller.xml b/app/src/main/res/layout/extension_detail_controller.xml
index 137b81f853..d91b5a84eb 100644
--- a/app/src/main/res/layout/extension_detail_controller.xml
+++ b/app/src/main/res/layout/extension_detail_controller.xml
@@ -60,6 +60,22 @@
         app:layout_constraintEnd_toEndOf="parent"
         tools:text="eu.kanade.tachiyomi.extension.en.myext"/>
 
+    <TextView
+        android:id="@+id/extension_obsolete"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="16dp"
+        android:background="@color/red_error"
+        android:gravity="center"
+        android:padding="16dp"
+        android:text="@string/obsolete_extension_message"
+        android:textColor="@android:color/white"
+        android:visibility="gone"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/extension_pkg" />
+
     <Button
         android:id="@+id/extension_uninstall_button"
         android:layout_width="0dp"
@@ -71,7 +87,7 @@
         style="@style/Theme.Widget.Button.Colored"
         app:layout_constraintStart_toStartOf="@id/guideline"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/extension_pkg" />
+        app:layout_constraintTop_toBottomOf="@id/extension_obsolete" />
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/extension_prefs_recycler"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 7318d62f8e..3e726fc151 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -161,6 +161,7 @@
     <string name="all_lang">All</string>
     <string name="ext_details">Details</string>
     <string name="ext_update">Update</string>
+    <string name="ext_obsolete">Obsolete</string>
     <string name="ext_install">Install</string>
     <string name="ext_pending">Pending</string>
     <string name="ext_downloading">Downloading</string>
@@ -173,6 +174,7 @@
     <string name="ext_available">Available</string>
     <string name="untrusted_extension">Untrusted extension</string>
     <string name="untrusted_extension_message">This extension was signed with an untrusted certificate and wasn\'t activated.\n\nA malicious extension could read any login credentials stored in Tachiyomi or execute arbitrary code.\n\nBy trusting this certificate you accept these risks.</string>
+    <string name="obsolete_extension_message">This extension is no longer available.</string>
     <string name="ext_version_info">Version: %1$s</string>
     <string name="ext_language_info">Language: %1$s</string>
     <string name="ext_empty_preferences">No preferences to edit for this extension</string>