feat(web): update firefox link and extra information

packages/web/src/index.html

@@ -434,7 +434,7 @@
             target="_blank"
           >
             <img aria-hidden="true" class="icon" src="/images/firefox.svg" />
-            Firefox Add-ons
+            Firefox Add-ons<sup>1</sup>
             <svg
               aria-hidden="true"
               xmlns="http://www.w3.org/2000/svg"
@@ -450,6 +450,12 @@
             </svg>
           </a>
         </div>
+        <p class="mt-16 text-gray-500 text-left">
+          <sup>1</sup> Due to technical issues with the Firefox Team, our extension's support on
+          Mozilla Add-ons has ended with version 5.5.5. However, you can still run a development
+          copy of the last version of the extension. Steps for this are available in our GitHub
+          repository. We appreciate your understanding and patience.
+        </p>
       </div>
     </main>
     <footer class="bg-secondary md:py-5 p-4">