diff --git a/app/src/main/java/oppen/ariane/ui/GemActivity.kt b/app/src/main/java/oppen/ariane/ui/GemActivity.kt
index 105fa41..332ab1c 100644
--- a/app/src/main/java/oppen/ariane/ui/GemActivity.kt
+++ b/app/src/main/java/oppen/ariane/ui/GemActivity.kt
@@ -2,6 +2,7 @@ package oppen.ariane.ui
 
 import android.content.Context
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.media.MediaPlayer
 import android.net.Uri
 import android.os.Bundle
@@ -12,8 +13,8 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.databinding.DataBindingUtil
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.google.android.material.snackbar.Snackbar
-import oppen.ariane.R
 import oppen.ariane.Ariane
+import oppen.ariane.R
 import oppen.ariane.databinding.ActivityGemBinding
 import oppen.ariane.io.GemState
 import oppen.ariane.io.bookmarks.BookmarksDatasource
@@ -26,12 +27,12 @@ import oppen.ariane.ui.bookmarks.BookmarkDialog
 import oppen.ariane.ui.bookmarks.BookmarksDialog
 import oppen.ariane.ui.content_image.ImageDialog
 import oppen.ariane.ui.content_text.TextDialog
+import oppen.ariane.ui.modals_menus.LinkPopup
 import oppen.ariane.ui.modals_menus.about.AboutDialog
 import oppen.ariane.ui.modals_menus.history.HistoryDialog
 import oppen.ariane.ui.modals_menus.input.InputDialog
 import oppen.ariane.ui.modals_menus.overflow.OverflowPopup
 import oppen.ariane.ui.modals_menus.set_home.SetHomeDialog
-import oppen.ariane.ui.modals_menus.LinkPopup
 import oppen.hideKeyboard
 import oppen.visibleRetainingSpace
 import java.io.File
@@ -39,6 +40,7 @@ import java.io.FileInputStream
 import java.io.FileOutputStream
 import java.net.URLEncoder
 
+
 const val CREATE_IMAGE_FILE_REQ = 628
 const val CREATE_AUDIO_FILE_REQ = 629
 
@@ -92,15 +94,18 @@ class GemActivity : AppCompatActivity() {
 
         history = HistoryInterface.default(this)
 
-        model.initialise(Datasource.factory(this), BookmarksDatasource.getDefault(applicationContext)){ state ->
+        model.initialise(
+            Datasource.factory(this),
+            BookmarksDatasource.getDefault(applicationContext)
+        ){ state ->
 
             binding.pullToRefresh.isRefreshing = false
 
             when(state){
-                is GemState.AppQuery -> runOnUiThread{ showAlert("App backdoor/query not implemented yet") }
+                is GemState.AppQuery -> runOnUiThread { showAlert("App backdoor/query not implemented yet") }
                 is GemState.ResponseInput -> runOnUiThread {
                     loadingView(false)
-                    InputDialog.show(this, state){ queryAddress ->
+                    InputDialog.show(this, state) { queryAddress ->
                         model.request(queryAddress)
                     }
                 }
@@ -123,10 +128,17 @@ class GemActivity : AppCompatActivity() {
                 EditorInfo.IME_ACTION_GO -> {
                     val input = binding.addressEdit.text.toString()
 
-                    if(input.startsWith("gemini://")){
+                    if (input.startsWith("gemini://")) {
                         model.request(input)
-                    }else{
-                        model.request("${Ariane.GEMINI_USER_SEARCH_BASE}${URLEncoder.encode(input, "UTF-8")}")
+                    } else {
+                        model.request(
+                            "${Ariane.GEMINI_USER_SEARCH_BASE}${
+                                URLEncoder.encode(
+                                    input,
+                                    "UTF-8"
+                                )
+                            }"
+                        )
                     }
 
                     binding.addressEdit.hideKeyboard()
@@ -138,7 +150,7 @@ class GemActivity : AppCompatActivity() {
         }
 
         binding.more.setOnClickListener {
-            OverflowPopup.show(binding.more){menuId ->
+            OverflowPopup.show(binding.more){ menuId ->
                 when (menuId) {
                     R.id.overflow_menu_search -> {
                         binding.addressEdit.hint = getString(R.string.main_input_search_hint)
@@ -149,9 +161,15 @@ class GemActivity : AppCompatActivity() {
                     R.id.overflow_menu_bookmark -> {
                         println("Bookmark: ---------------------------")
                         val name = adapter.inferTitle()
-                        BookmarkDialog(this, BookmarkDialog.mode_new, bookmarkDatasource, binding.addressEdit.text.toString(), name ?: ""){ _, _ ->
+                        BookmarkDialog(
+                            this,
+                            BookmarkDialog.mode_new,
+                            bookmarkDatasource,
+                            binding.addressEdit.text.toString(),
+                            name ?: ""
+                        ) { _, _ ->
                             bookmarkDatasource.get { bookmarks ->
-                                bookmarks.forEach {bookmark ->
+                                bookmarks.forEach { bookmark ->
                                     println("Bookmark: ${bookmark.label}: ${bookmark.uri}")
                                 }
                             }
@@ -159,7 +177,7 @@ class GemActivity : AppCompatActivity() {
                     }
                     R.id.overflow_menu_bookmarks -> {
                         println("Bookmarks: --------------------------")
-                        BookmarksDialog(this, bookmarkDatasource){ bookmark ->
+                        BookmarksDialog(this, bookmarkDatasource) { bookmark ->
                             model.request(bookmark.uri)
                         }.show()
                     }
@@ -176,12 +194,12 @@ class GemActivity : AppCompatActivity() {
                             startActivity(Intent.createChooser(this, null))
                         }
                     }
-                    R.id.overflow_menu_history -> HistoryDialog.show(this){ historyAddress ->
+                    R.id.overflow_menu_history -> HistoryDialog.show(this) { historyAddress ->
                         model.request(historyAddress)
                     }
                     R.id.overflow_menu_about -> AboutDialog.show(this)
                     R.id.overflow_menu_set_home -> {
-                        SetHomeDialog.show(this, binding.addressEdit.text.toString()){
+                        SetHomeDialog.show(this, binding.addressEdit.text.toString()) {
                             showAlert("Home capsule updated")
                         }
                     }
@@ -222,7 +240,12 @@ class GemActivity : AppCompatActivity() {
     private fun externalProtocol(state: GemState.NotGeminiRequest) = runOnUiThread {
         loadingView(false)
         val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(state.uri.toString()))
-        startActivity(browserIntent)
+
+        if (browserIntent.resolveActivity(packageManager) != null) {
+            startActivity(browserIntent)
+        } else {
+            showAlert("No app installed that can open ${state.uri}")
+        }
     }
 
     private fun renderGemtext(state: GemState.ResponseGemtext) = runOnUiThread {