Message and News Reading
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ThunderSuite - Customize your Quick Access Sidebar
This extension allows user editing of the spaces sidebar.
Create custom spaces from the extension options, to turn the new toolbar introduced with Supernova into your personal quick access toolbox.
Unmangle Microsoft ATP Safelinks
Users of outlook.com and o365 who have Advanced Thread Protection enabled will have all URL's in emails changed to redirect them to an Microsoft filter before opening. This is a bad idea.
This plugin will change the URL back to the original value.
FlashGot Mass Downloader Requires Restart
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
Show InOut
Adds two columns to the list of mails. One shows an indicator wether a mail is incoming or outgoing, the other shows the sender or the recipient of the mail respectively...
Menu On Top (SuperMenu Avatar) Requires Restart
Move the Thunderbird menu bar to the top. Choose from a selection of visual styles + colors. Add frequently used bookmarks and an avatar icon without wasting precious screen space. Bookmark your favorite sites, emails, folders or configuration pages.
Slideshow Requires Restart
Displays a slideshow of picture attachments. When email has attached pictures, it displays "View as Slideshow" button next to the attachment. Button click pops a slideshow window with all the images, allowing you to zoom in/out, save...
Quick Web Search Requires Restart
Quick search for selection text in Web. Customized for Google, Yandex, Bing, Yahoo, AOL and Baidu.
Open In Conversation Requires Restart
Make the default message list action be "Open Message in Conversation" when double-clicking or using the "Enter" key to open an email from the message list.
UrgentMail
Raise X11 urgent flag if new mail is received.
This addon listens for incoming mails and causes the Thunderbird window to draw attention.
Get Partial Messages Requires Restart
Get the rest of all partially downloaded messages from server.
Quote Colors & Collapse
Configure text and background colors of quotes in mail and news messages. From up addon version 3 (Thunderbird 91) you can collapse quotes.
CompactHeader Requires Restart
Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.
QuickFilter Unreplied Requires Restart
Battered with Emails? Need to sort them out? This extension adds a button to the Quick Filter toolbar that shows only unreplied emails. The extension works instantly, just install and look at your Quick Filter toolbar.
Bookmarks: eMails and XNotes - Quick 'Jump To'
Bookmark Toolbar and Menu for easy switching to emails and XNotes.
While you can already 'star' or 'tag' emails, they are still hidden in their (deeply nested?) folder and are not in direct daily view.
Bookmark them!
AttachmentCount
Adds a column to the Thunderbird message list to always display the true attachment count. An icon is shown for single attachments or all attachments deleted/detached. Tooltip preview of single attachment content and summary for multiple attachments.
To create your own collections, you must have a Mozilla Add-ons account.