Thank you for making this extension. It works just fine in place of the Google Dictionary extension that I miss so much when I switched over to Firefox.
There are some things that I wish you could improve on, however, such as a fix for when the definition bubble pop-ups stick to one side of the screen (or even show up outside of your device's screen, especially on devices that have smaller screens) as well as a when double clicking on a word in the pop-up bubble that creates a new bubble on the edge of the previous one instead of on top of it.
I also have a feature request that would be awesome if you could include, which is the ability for users to set a hot-key (keyboard combination shortcut) for opening up the dictionary.
But still, even if these don't get added anytime soon, I'd still like to thank you for making this extension!