German Dictionary, extended for Austria is a version of the German dictionary add-on, extended with Austrian words, for spell checking in Mozilla products such as Firefox, Thunderbird, SeaMonkey, etc.
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".
Product's homepage
Requirements:
· Mozilla Thunderbird