Take it with you for all sites!
1. Drag to your bookmark bar: tuntext.
2. Select a text in any page.
3. Click on it and ta-da!
Go on, try it.
If something is missing, let me know.
You can press on a word or select a phrase to get its translation.
You can also middle-click to open a dictionary on a new tab.
If there's no specialized dictionary, it takes you to Google images.