add faq for browser extension errors

Author: jprein

dist/manual.html

@@ -792,6 +792,13 @@ <h3>Trouble Shooting</h3>
                 Please note that Safari (especially on iOS) has issues with
                 webcam recordings. Try another browser!
               </li>
+              <li>
+                We have noticed that the TANGO-CC is sometimes not working properly on Safari when browser extensions are enabled. 
+                For example, extensions like add blockers (e.g. UBlock Origin), password managers (e.g. 1Password) and typing assistants (e.g. Grammarly) might inject JavaScript which interferes with the task.
+                In these cases, the task might load but the audio instructions do not play and clicks cannot be registered.
+                Please try to disable all browser extensions and reload the page. It might be necessary to restart the browser.
+                You can also try to open the website in a private window or another browser. 
+              </li>
               <li>
                 In any case, it might be worthwile to try another browser or
                 reload the page.

public/manual.html

@@ -792,6 +792,13 @@ <h3>Trouble Shooting</h3>
                 Please note that Safari (especially on iOS) has issues with
                 webcam recordings. Try another browser!
               </li>
+              <li>
+                We have noticed that the TANGO-CC is sometimes not working properly on Safari when browser extensions are enabled. 
+                For example, extensions like add blockers (e.g. UBlock Origin), password managers (e.g. 1Password) and typing assistants (e.g. Grammarly) might inject JavaScript which interferes with the task.
+                In these cases, the task might load but the audio instructions do not play and clicks cannot be registered.
+                Please try to disable all browser extensions and reload the page. It might be necessary to restart the browser.
+                You can also try to open the website in a private window or another browser. 
+              </li>
               <li>
                 In any case, it might be worthwile to try another browser or
                 reload the page.