sound and flash blocker
When I first started using Duolingo, the sound worked perfectly, but suddenly a box now appears saying that "duolingo cannot play sound" and either refresh (which I do with no results) or add duolingo to the white list in your flash blocker. How do I access that? (A search of my files did not help.)
Click on Tools-Add-ons-Extensions. Look and see if you have Flashblock installed. If so click on "options" by it then click on "whitelist" and add duolingo.com to the list. If you do not have flashblock see if you have "NoScript" installed. If so you may have to add duolingo.com to its whitelist.
Thanks for these suggestions. I did look, and no, I don't have either of these. I DO have DoNotTrackMe, but that doesn't seem to be an issue as far as I can tell. I don't quite get it, but who knows? My old Windows7 is not what it used to be.