REGARDING THE DUOLIBRO CHROME EXTENSION:
I am aware of the issue and activily working on fixing it.
A while ago Duolingo changed some code on their website, that temporarily disabled the Duolibro extension.
I already contacted them about this issue.
It would help a lot if you could upvote and comment on this thread on the Duolingo forums, asking them to change the code so that Duolibro works again.