diff --git a/app/src/main/kotlin/com/svenjacobs/app/leon/ui/common/Browser.kt b/app/src/main/kotlin/com/svenjacobs/app/leon/ui/common/Browser.kt
new file mode 100644
index 00000000..0c674c64
--- /dev/null
+++ b/app/src/main/kotlin/com/svenjacobs/app/leon/ui/common/Browser.kt
@@ -0,0 +1,11 @@
+package com.svenjacobs.app.leon.ui.common
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+
+fun isDefaultBrowser(context: Context): Boolean {
+	val intent = Intent(Intent.ACTION_VIEW, Uri.parse("https://"))
+	val activity = intent.resolveActivity(context.packageManager)
+	return activity?.packageName?.startsWith("com.svenjacobs.app.leon") ?: false
+}
diff --git a/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/main/MainScreen.kt b/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/main/MainScreen.kt
index 5d0f436d..0f4bb47d 100644
--- a/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/main/MainScreen.kt
+++ b/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/main/MainScreen.kt
@@ -73,6 +73,7 @@ import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
 import com.svenjacobs.app.leon.R
 import com.svenjacobs.app.leon.core.domain.action.ActionAfterClean
+import com.svenjacobs.app.leon.ui.common.isDefaultBrowser
 import com.svenjacobs.app.leon.ui.common.views.TopAppBar
 import com.svenjacobs.app.leon.ui.screens.main.model.MainScreenViewModel
 import com.svenjacobs.app.leon.ui.screens.main.model.MainScreenViewModel.UiState.Result
@@ -158,6 +159,10 @@ fun MainScreen(
 	}
 
 	fun openUrl(result: Result.Success) {
+		// When Leon is the system default browser we neither can open the URL in custom tabs nor
+		// in the default browser because this would just open Leon again.
+		if (isDefaultBrowser(context)) return
+
 		if (uiState.isCustomTabsEnabled) {
 			openInCustomTabs(result)
 		} else {
@@ -375,6 +380,7 @@ private fun SuccessBody(
 					OutlinedButton(
 						modifier = buttonModifier,
 						onClick = { onOpenClick(result) },
+						enabled = !isDefaultBrowser(LocalContext.current),
 					) {
 						Text(
 							text = stringResource(R.string.open),
diff --git a/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/settings/SettingsScreen.kt b/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/settings/SettingsScreen.kt
index f0975207..d24c2570 100644
--- a/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/settings/SettingsScreen.kt
+++ b/app/src/main/kotlin/com/svenjacobs/app/leon/ui/screens/settings/SettingsScreen.kt
@@ -41,6 +41,7 @@ import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -48,6 +49,7 @@ import androidx.lifecycle.viewmodel.compose.viewModel
 import com.svenjacobs.app.leon.BuildConfig
 import com.svenjacobs.app.leon.R
 import com.svenjacobs.app.leon.core.domain.action.ActionAfterClean
+import com.svenjacobs.app.leon.ui.common.isDefaultBrowser
 import com.svenjacobs.app.leon.ui.screens.settings.model.SettingsScreenViewModel
 import com.svenjacobs.app.leon.ui.theme.AppTheme
 import com.svenjacobs.app.leon.ui.tooling.DayNightPreviews
@@ -127,6 +129,7 @@ private fun Content(
 					text = stringResource(R.string.open_in_custom_tabs),
 					checked = customTabsEnabled,
 					onCheckedChange = onCustomTabsSwitchCheckedChange,
+					enabled = !isDefaultBrowser(LocalContext.current),
 				)
 
 				Column(
@@ -215,6 +218,7 @@ private fun SwitchRow(
 	checked: Boolean,
 	onCheckedChange: (Boolean) -> Unit,
 	modifier: Modifier = Modifier,
+	enabled: Boolean = true,
 ) {
 	Row(
 		modifier = modifier.fillMaxWidth(),
@@ -230,6 +234,7 @@ private fun SwitchRow(
 		Switch(
 			checked = checked,
 			onCheckedChange = onCheckedChange,
+			enabled = enabled,
 		)
 	}
 }