Yet Another Remove It Permanently Requires Restart

Remove elements and block content on Web pages.

YNote Requires Restart

Make some text notable on the each folder in folder's property dialog box.

YouTube RSS feed redesign

Adds YouTube thumbnails to RSS feed entries

YouTube Video Downloader

The Complete Guide to YouTube Video Downloader Converter Tool and How They Can Help You Easily Download and Convert Videos from YouTube.

ZenbuShiitake Requires Restart

Zendesk Widget Requires Restart

Provides a simple integration with Zendesk by displaying some information about the ticket when you open the notification mail for the ticket

This extension is not affiliated with Zendesk in any way. The Zendesk logo is (c) by Zendesk.

zFiler mail Requires Restart

Automatic conversion from 'plain' attachments to zFiler links, when message is being sent.

Zhong Wen Requires Restart

Mouse over a Chinese character to find out it's meaning. A popup will appear showing the 'Pinyin' pronunciation, the simplified character form, and the English translation. You can customize what parts to show on the preferences window.

Zindus Requires Restart

Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)

Zivver for Thunderbird

This extension automatically detects Zivver messages and decrypts them on-the-fly using the Zivver API. Messages are decrypted only when actively displayed by the user and are never stored locally.

ZNotes Requires Restart

Save everything you like. Simple text notes and pages downloaded from the internet, rich multimedia. Store any files and contacts from your address book with notes.

Zoiper Thunderbird Plugin Requires Restart

It allows you to make calls via Zoiper from Mozilla Thunderbird.

Zombie Keys (Multilanguage Keyboard) Requires Restart

Enter accents, diacritics, diaeresis, umlauts, ligatures etc. with keyboards of various countries (us,uk,ie,fr,it,ru,de,sv) - via easy to remember shortcuts or menu. Also supports all textboxes of the application (such as search, filters).

Zonio Freebusy for Lightning Requires Restart

Finds when are people available for a meeting or event via Zonio Freebusy service. Displays freebusy blocks instantly in Invite Attendees window while attendees are being added. Works with both local calendar storage or any calendar provider.

Zoom Button for Thunderbird Requires Restart

Zoom in, zoom out, and reset zoom with one toolbar button. Works in the Compose window too.

Zulip - Quick Access

Quick Access to Zulip in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

[Un]read Requires Restart

This Thunderbird extension adds a button (plus keyboard shortcut) which allows for quickly switching between the 'view all'/'view unread' message filters. Moreover, if you are in the 'view unread' mode and you start...

~okeanos for Filelink Requires Restart

Add ~okeanos support to Thunderbird's Filelink feature.

✨ Awesome Emoji Picker ✨

Modern, nice emoji picker that you can use to find and select emojis. It will be copied to your clipboard or even directly inserted into the e-mail, when you click on it.

You will certainly like it.

中止ボタンがしいたけに見えて困る Requires Restart

Huh, you said the stop button looks like shiitake? No way, you must be tired.