Most of the time it says "Sorry, not available". And it's impossible to discard after double tapping on a word in a text field. Sometimes, too many dictionary pop-ups appear for many words and impossible to get rid of them. There's no close button.
Super annoying and unhelpful

Doesn't work - "Sorry

No definition found."

Used to work great, now, you click a word and it pops up with a notice that says "sorry, no definition found" Moving on to another plugin.

I used this for so long I forgot it was an extension. But as plenty of others have said, it no longer works.

Used to work perfectly, now is completely nonfunctional. Really a shame, I used to enjoy getting definitions for words without having to Google them but every single word comes back with no definition found.

Worst dictionary extension i've ever used, half the time when highlighting a word it doesn't even work. Google dictionary is better.

I enjoyed it while it lasted. Stopped working recently and I have finally removed it from my extensions.

Used to love this app, but it hasn't worked in a year

No Definition Found, and this is the case for every word out there, Sadly now this is useless.

Doesn't function.

This used to work perfectly but lately it just says no definition for every single word. As of now it is completely useless and I have removed it from my extensions.

Doesn't work anymore. Hasn't been updated in 5 years. Developer is gone. This app is basically dead

Doesn't work anymore, everything comes back as "defintion cannot be found" useless

Doesn't work. It no longer brings up definitions. It might be because double clicking a word includes a space at the end. Who knows.

This extension used to be good but it no longer works. Shame.

doesn't work

doent work anymore

It doesn't work.
Firefox should stop recommending this shit.

No longer working. Every word comes back without any definition.

recently this addon has stopped working. It is showing no definition found on every word I tried. Please report it as not working

it just stopped working lately... lame, because it worked pretty well while it did work! awesome concept but. just doesnt work. it only says "no definition found" now