***EDIT*** July 10, 2018
Hi Mr. Birtles, I've recently updated and while it seems to work much better (thank you very much for fixing this!) I now intermittently run into an issue where the application sits in constant 'Rikaichamp loading...'. This is already noted on the Github issues tracking list however, and a simple browser restart solves it.

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I will echo the sentiments of the user below this review -- I have noticed the exact same issue. The extension will not work at all until you toggle it off and back on. It is quite an aggravating issue that I'd ask the developer to please have a look at.