Quant al complement
Unofficial x64 builds of Thunderbird are NOT supported. However, you can still use this add-on with a standard 32-bit version of Thunderbird on a 64-bit operating system.
This add-on does NOT work with Thunderbird 2.0.0.*. Please upgrade your Thunderbird to the latest version.
Enhanced Glasser Theme
Glasser for Thunderbird includes a new, improved theme for Thunderbird to provide a better integration with the Windows 7 interface. If you use your own theme, you may want to disable this feature:
1. Open Tools -> Options...
2. On the Advanced page, select the General tab
3. Click the Config Editor button. Clear any warning message that is displayed
4. Enter 'glasser' (no quotes) in the search box
5. Double-click on the preference called "extensions.glasser.enableTheme"
6. Restart Thunderbird
Glasser for Thunderbird is based on Glasser for Firefox, developed by 6XGate.