Some of my listening comprehension exercises feature a blurred translation so that you can listen to the sound file before looking at the English translation. Just click the blurred part when you’re ready to read it, and note that you might need to leave the mouse there. Sometimes it re-blurs when you move the mouse away but stays unblurred as long as the mouse stays on top of it.
If it doesn’t work at all, please go to this discussion and respond with your info to help the plugin author figure out the problem. There’s no point in writing to me: the unblurring works on my computer and I’m not a developer so I have no idea how to fix any issues.