It looked very interesting based on the screenshots. But the website seems to be down making this a useless extension in its present state.

Free only 10 days? Why it's not mentioned it's not free? Anyway, the extension is badly made, as I have a yellow window warning from Firefox, telling me that it slows the browser. The extension button doesn't seem to work. I've tried to add a webpage article directly in the site, but it's not working. Uninstalled.

Great add-ons for improving his foreign language skills while surfing on the web. Very valuable when I misunderstand words and want to revise them later.

... it would have been the best companion of my language training.
Keep up the good work guys !