Remove more occurrences of extensiontest.com (#1900)

src/content/documentation/develop.md

@@ -217,7 +217,7 @@ If you develop Android apps, when you want to include a browser experience in yo
 
 The Firefox extension environment is highly compatible with chromium-based extension technology. Your extension might already be capable of running on Firefox, or need only a few changes.
 
-[Test your extension’s compatibility](https://www.extensiontest.com/) and check out our [porting guide](/documentation/develop/porting-a-google-chrome-extension/) to get started.
+Check out our [porting guide](/documentation/develop/porting-a-google-chrome-extension/) to get started.
 
 {% endcapture %}
 {% include modules/two-column.liquid,

src/data/pages.json

@@ -504,10 +504,6 @@
           {
             "category": "Port Your Extension",
             "pages": [
-              {
-                "title": "Extension compatibility test",
-                "url": "https://www.extensiontest.com/"
-              },
               {
                 "title": "Porting a Google Chrome Extension",
                 "url": "/documentation/develop/porting-a-google-chrome-extension/"

src/includes/home/build.md

@@ -176,9 +176,7 @@ Firefox is at the forefront of cross-browser compatibility. Firefox add-ons are
 
 ### Your extension might already be compatible!
 
-See if your extension works in Firefox. Simply upload your `.crx` file.
-
-[Test your extension](https://www.extensiontest.com/)
+See if your extension works in Firefox. Simply upload your `.crx` file to the [Developer Hub](https://addons.mozilla.org/developers/addon/validate).
 
 </div>
 </div>