I have been using this browser extension for a while, and it really accelerates my English learning!
However, there is one hassle that while I’m shadowing scripts, I have to click the script over and over again. When people are shadowing, they usually practice pronunciation of a specific segment repeatedly, especially the phrase is spoken very fast.
So, I suggest adding a new feature, that is “segment loop/repeat” which enables users to specify 2 points, A and B, so the playback repeats this specified segment until you stop it.
I guess there are quite a lot of demands on this feature!
By the way, I make use of another extension together to adjust the playback speed more precisely when shadowing.