Hier sind alle Erweiterungen für den Thunderbird drin, die ich so installiere...
Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.
To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".
German Dictionary (new Orthography) for spellchecking in Mozilla products
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Switch the signature on/off or choose a new one from your predefined set...
Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly.
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
Displays a menu item for switching the application locale.
Allow to redirect (a.k.a. "bounce") mail messages to other recipients.