Rated 5 out of 5 stars

Great work but it should improve immediately new features like you say :

"What's next for Context Highlight
There are three main features I'd like to add to Context Highlight in the future: 1) Some form of preferences GUI to expose and allow customisation some of the features that aren't so obvious (for example, holding CTRL when clicking "Highlight word" doesn't clear existing highlighting). 2) Colour customisation - allowing users to choose their own colours. 3) Characters to ignore (I've had requests for ignoring things like underscores) - this would definitely be optional and set via a user preference. I'll happily discuss and consider other requests, as well as accept code contributions."

This review is for a previous version of the add-on (0.3.3).