From December 15th, 2017 to May 24th, 2018, 50% user give 4-star rating, 50% user give 3-star rating. for Kanji Tab chrome extension.
Kudos for writing all of that JS!
When i went to try it, it was fine. It gives a good explanation of kanji and shows pictures of them. I can't figure out how to close the tab :/ I guess i'll have to remove the extention.