Bug 1675599 - Make "OK" button in the Select Helper Application dialog the default button r=jaws

Differential Revision: https://phabricator.services.mozilla.com/D96097

toolkit/components/apppicker/content/appPicker.xhtml

@@ -17,7 +17,7 @@
   <dialog id="app-picker"
     buttons="accept,cancel,extra2"
     buttonlabelextra2="&BrowseButton.label;"
-    defaultButton="cancel">
+    defaultButton="accept">
 
     <script src="chrome://global/content/appPicker.js"/>