contrib/logo-color: mark the external link

... with FireFox 149.0, which comes with graphical changes.

CERTIFICATES.md

@@ -32,13 +32,13 @@ is to use a desktop browser to get that information. This demonstration uses
 [Mozilla Firefox ↗️](https://www.mozilla.org/firefox/).
 
 Let's assume we want to make sure the certificate for
-[git.eworm.de](https://git.eworm.de/) is available. Open that page in the
-browser, then click the *lock* icon in addressbar, followed by "*Connection
-secure*".
+[rsc.eworm.de](https://rsc.eworm.de/) is available. Open that page in the
+browser, then click the *shield* icon in addressbar, followed by
+"*Connection secure*".
 
 ![screenshot: dialog A](CERTIFICATES.d/01-dialog-A.avif)
 
-The dialog will change, click "*More information*".
+The dialog will change, click "*More site information*".
 
 ![screenshot: dialog B](CERTIFICATES.d/02-dialog-B.avif)
 

contrib/logo-color.html

@@ -45,7 +45,7 @@ logo and download it.</p>
 <p><img src="logo-color.d/browser-03.avif" alt="Screenshot Browser 03"></p>
 
 <p>(This example is with
-<a href="https://www.mozilla.org/de/firefox/new/">Firefox</a>. The workflow
+<a href="https://www.mozilla.org/firefox/">Mozilla Firefox ↗️</a>. The workflow
 for other browsers may differ.)</p>
 
 <p>See how to