Works very well. Had issues with other highlighter addons but this worked great. The one downside I found is this will embed code in WSYIWIG editors that may then appear on pages to other users.

Constantly "There was an error loading your highlights. Please try refreshing the page"

works? yes. perfectly? almost.

It does not save highlighted phrases any more, which was the reason I installed this app in the first place. It just says "There was an error loading your highlights. Please try refreshing the page". It's still great for just highlighting text though.