Add-ons
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Allow HTML Temp
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
Nederlands (nl) Language Pack
Brazilian Portuguese Dictionary (Former Spelling)
The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).
G-Hub Lite
Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
CategoryManager
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
CardDAV Browser
A utility to browse vCards stored on a CardDAV server.
This version is only for Thunderbird. There is a SeaMonkey version available if needed.
German dictionary (de_AT)
German dictionary igerman98 (de_AT, Austria), for Firefox, Thunderbird und Seamonkey.
Edit Email Subject (EES)
Xpunge
Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.
ReplyWithHeader
Croatian Dictionary (Hrvatski Rječnik)
Croatian Dictionary (Hrvatski Rječnik) for Mozilla Firefox, Thunderbird and SeaMonkey
Lithuanian spelling check dictionary
Lithuanian spellchecking dictionary for Mozilla applications. Included by default in Lithuanian localized versions of Mozilla software.
Google Keep Tab
Folder Pane View Switcher
Folder view arrows; switch to "All Folders" view when hovering during drag & drop; allow user to select which views are enabled or tied to the view arrows.
To create your own collections, you must have a Mozilla Add-ons account.
