Most of the time, its more than great! I love this add on so much and I dont know what I would do without it. The only reason I rated it 4 stars is that for some reason, for extended periods of time, it will just say "Sorry, no definition found" on words that I know it has been able to find a definition for before, and it does it to EVERY word, even simple ones. I'm stuck in that state right now unfortunately. Other than this, props to the dev!