diff --git a/app/src/main/java/org/openobservatory/ooniprobe/activity/reviewdescriptorupdates/ReviewDescriptorUpdatesActivity.kt b/app/src/main/java/org/openobservatory/ooniprobe/activity/reviewdescriptorupdates/ReviewDescriptorUpdatesActivity.kt
index 6cebefeda..6a47df898 100644
--- a/app/src/main/java/org/openobservatory/ooniprobe/activity/reviewdescriptorupdates/ReviewDescriptorUpdatesActivity.kt
+++ b/app/src/main/java/org/openobservatory/ooniprobe/activity/reviewdescriptorupdates/ReviewDescriptorUpdatesActivity.kt
@@ -109,57 +109,48 @@ class ReviewDescriptorUpdatesActivity : AbstractActivity() {
             reviewUpdatesPagingAdapter = ReviewUpdatesPagingAdapter(this, descriptors)
             binding.viewpager.adapter = reviewUpdatesPagingAdapter
 
-            /**
-             * The bottom bar menu item click listener.
-             * When the user clicks on the update button, the viewpager is swiped to the next page.
-             * When the user clicks on the last update, the activity is finished.
-             */
-            val bottomBarOnMenuItemClickListener: Toolbar.OnMenuItemClickListener =
-                    Toolbar.OnMenuItemClickListener { item ->
-                        when (item.itemId) {
-                            R.id.update_descriptor -> {
-                                descriptorManager.updateFromNetwork(descriptors[binding.viewpager.currentItem])
-                                /**
-                                 * **[currPos]** is the current position of the viewpager.
-                                 * If the current position is not the last position, the viewpager is swiped to the next page.
-                                 * If the current position is the last position, the last update is saved in the shared preferences and the activity is finished.
-                                 */
-                                val currPos: Int = binding.viewpager.currentItem
-                                if ((currPos + 1) != binding.viewpager.adapter?.itemCount) {
-                                    binding.viewpager.currentItem = currPos + 1
-                                } else {
-                                    setResult(
-                                            RESULT_OK,
-                                            Intent().putExtra(RESULT_MESSAGE, "Link(s) updated")
-                                    )
-                                    finish()
-                                }
-                                true
-                            }
-
-                            else -> false
+            binding.btnUpdate.setOnClickListener {
+                /*
+                 * When the user clicks the update button, the descriptor is updated.
+                 * If the current item is the last item in the viewpager, the result is set to "Link(s) updated" and the activity is finished.
+                 * If the current item is not the last item in the viewpager, the viewpager is swiped to the next item.
+                 */
+                with(binding.viewpager) {
+                    descriptorManager.updateFromNetwork(descriptors[currentItem])
+                    when (currentItem) {
+                        adapter?.itemCount?.minus(1) -> {
+                            // Last update
+                            setResult(
+                                    RESULT_OK,
+                                    Intent().putExtra(RESULT_MESSAGE, "Link(s) updated")
+                            )
+                            finish()
+                        }
+
+                        else -> {
+                            // Not the last update
+                            currentItem += 1
                         }
                     }
-            binding.bottomBar.setOnMenuItemClickListener(bottomBarOnMenuItemClickListener)
+                }
+            }
 
-            /**
-             * The viewpager page change callback.
-             * When the user swipes to the next page, the bottom bar menu item title is updated.
-             */
             binding.viewpager.registerOnPageChangeCallback(object : OnPageChangeCallback() {
                 override fun onPageSelected(position: Int) {
-                    binding.bottomBar.menu.findItem(R.id.update_descriptor)
-                            ?.let {
-                                val countString =
-                                        "(${position + 1} of ${binding.viewpager.adapter?.itemCount})"
-                                supportActionBar?.title = "Link Update $countString"
-                                it.title = if ((position + 1) != binding.viewpager.adapter?.itemCount) {
-                                    "UPDATE $countString"
-                                } else {
-                                    "UPDATE AND FINISH $countString"
-                                }
-                            }
+                    /*
+                     * When the user swipes to the next item in the viewpager, the title of the action bar is updated.
+                     * If the current item is the last item in the viewpager, the text of the button is updated to "UPDATE AND FINISH".
+                     * If the current item is not the last item in the viewpager, the text of the button is updated to "UPDATE".
+                     */
+                    val countString = "(%d of %d)".format(position + 1, binding.viewpager.adapter?.itemCount)
+
+                    supportActionBar?.title = "Link Update $countString"
 
+                    binding.btnUpdate.text = when (position + 1) {
+                        binding.viewpager.adapter?.itemCount -> "UPDATE AND FINISH $countString"
+
+                        else -> "UPDATE $countString"
+                    }
                 }
             })
 
diff --git a/app/src/main/java/org/openobservatory/ooniprobe/common/OONIDescriptor.kt b/app/src/main/java/org/openobservatory/ooniprobe/common/OONIDescriptor.kt
index 7205d1395..79b01dbd8 100644
--- a/app/src/main/java/org/openobservatory/ooniprobe/common/OONIDescriptor.kt
+++ b/app/src/main/java/org/openobservatory/ooniprobe/common/OONIDescriptor.kt
@@ -15,6 +15,7 @@ import org.openobservatory.ooniprobe.activity.runtests.RunTestsActivity
 import org.openobservatory.ooniprobe.activity.runtests.models.ChildItem
 import org.openobservatory.ooniprobe.activity.runtests.models.GroupItem
 import org.openobservatory.ooniprobe.model.database.TestDescriptor
+import org.openobservatory.ooniprobe.model.database.Url
 import org.openobservatory.ooniprobe.test.suite.DynamicTestSuite
 import org.openobservatory.ooniprobe.test.test.*
 import java.io.Serializable
@@ -123,6 +124,11 @@ abstract class AbstractDescriptor<T : BaseNettest>(
      * @return [DynamicTestSuite] representing the test suite for the current descriptor.
      */
     open fun getTest(context: Context): DynamicTestSuite {
+        this.nettests.forEach { nettest ->
+            nettest.inputs?.forEach { input ->
+                Url.checkExistingUrl(input)
+            }
+        }
         return DynamicTestSuite(
             name = this.name,
             title = this.title,
diff --git a/app/src/main/res/layout/activity_review_descriptor_updates.xml b/app/src/main/res/layout/activity_review_descriptor_updates.xml
index 80fa5b690..7945f49cb 100644
--- a/app/src/main/res/layout/activity_review_descriptor_updates.xml
+++ b/app/src/main/res/layout/activity_review_descriptor_updates.xml
@@ -34,12 +34,28 @@
         android:layout_gravity="bottom"
         android:theme="@style/Theme.MaterialComponents.Light.DarkActionBar.App.NoActionBar">
 
-        <androidx.appcompat.widget.Toolbar
-            android:id="@+id/bottomBar"
+        <LinearLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
+            android:layout_height="?attr/actionBarSize"
             android:background="@color/color_gray0"
-            app:menu="@menu/update_descriptor"
-            app:titleTextAppearance="@style/TextAppearance.Widget.AppCompat.Toolbar.Title.App" />
+            android:gravity="end">
+
+            <View
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1" />
+
+            <Button
+                android:id="@+id/btn_update"
+                style="?android:attr/buttonBarButtonStyle"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1.5"
+                android:layout_gravity="center"
+                android:elevation="0dp"
+                android:text="@string/OONIRun_Update"
+                android:textColor="@color/color_base" />
+
+        </LinearLayout>
     </com.google.android.material.appbar.AppBarLayout>
 </androidx.coordinatorlayout.widget.CoordinatorLayout>
\ No newline at end of file