Define is a Firefox extension to search the definition of the highlighted text at Google.
If there is highlighted text, a new option is added to the context menu. This option search the definition of the highlighted text at Google (like searching "define:some_text").
How to Install in Thunderbird:
1. Right-click the link below and choose "Save Link As..." to download and save the file to your hard disk.
2. In Mozilla Thunderbird, open Add-ons from the Tools menu.
3. Click the Install button, and locate/select the file you downloaded and click "OK".
- Added option to open new tab next to the current one.