don't allow edit action if not editable

platform/platform-impl/src/com/intellij/util/ui/table/TableModelEditor.java

@@ -96,6 +96,12 @@ public class TableModelEditor<T> implements ElementProducer<T> {
             table.requestFocus();
           }
         }
+      }).setEditActionUpdater(new AnActionButtonUpdater() {
+        @Override
+        public boolean isEnabled(AnActionEvent e) {
+          T item = table.getSelectedObject();
+          return item != null && ((DialogItemEditor<T>)TableModelEditor.this.itemEditor).isEditable(item);
+        }
       });
     }
   }
@@ -142,6 +148,10 @@ public class TableModelEditor<T> implements ElementProducer<T> {
     public abstract void edit(@NotNull T item, @NotNull Function<T, T> mutator);
 
     public abstract void applyEdited(@NotNull T oldItem, @NotNull T newItem);
+
+    public boolean isEditable(@NotNull T item) {
+      return true;
+    }
   }
 
   @NotNull

xml/impl/src/com/intellij/ide/browsers/BrowserSettingsPanel.java

@@ -256,6 +256,11 @@ public class BrowserSettingsPanel {
         oldItem.setSpecificSettings(newItem.getSpecificSettings());
       }
 
+      @Override
+      public boolean isEditable(@NotNull ConfigurableWebBrowser browser) {
+        return browser.getSpecificSettings() != null;
+      }
+
       @Override
       public boolean isRemovable(@NotNull ConfigurableWebBrowser item) {
         return !WebBrowserManager.getInstance().isPredefinedBrowser(item);

xml/impl/src/com/intellij/ide/browsers/chrome/ChromeSettings.java

@@ -47,6 +47,7 @@ public final class ChromeSettings extends BrowserSpecificSettings {
     return myUseCustomProfile;
   }
 
+  @Nullable
   @Tag("command-line-options")
   public String getCommandLineOptions() {
     return myCommandLineOptions;