Message and News Reading
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.
Show Outlook Appointments (vcal / ics) Requires Restart
An extension to show embedded Outlook calendar (vcal / ics) parts.
Thunderbird doesn't show calendar parts from Outlook appointment emails. This addon adds a button to download the embedded appointment as ICS to import it into another calendar.
AttachmentExtractor Continued Requires Restart
This add-on is a (work in progress) fixed version of the original Add-on "AttachmentExtractor" which is no longer supported and fixed by the original author.
It Extracts all attachments from selected messages and then can delete, detach...
Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird
Seturgent Requires Restart
Sets the urgent flag (X11) of the Thunderbird window under Linux in case of new messages. Does ignore special folders like Drafts, Junk and such.
Users of Office 365 Advanced Threat Protection wil change
all url's in emails to redirect them to an Microsoft filter before opening.
This plugin wil change the url back to the original value.
Bugmail (fixed version) Requires Restart
A bugzilla companion (fixed version). Originally maintained by Fabrice Desré.
Send to Things for Thunderbird Requires Restart
Create a new Things task from the current email you are viewing. Opens the quick add dialog with subject and message content pre-filled.
I've created this add-on as a user of Things, it is not created or endorsed by Cultured Code.
Remote Content By Folder Requires Restart
Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.
ToggleReplied Requires Restart
Enables toggling of replied, forwarded, and redirected states of messages.
attachment column in search result list Requires Restart
Show the column for attachments in search results list. General search (edit-> search -> search emails) does not show by default if a message has attachments.
This addon adds this column, just as in a normal folder view.
Delete Read Emails Requires Restart
Adds a button in Thunderbird's toolbar that enables you to delete all your read emails at once
New Thread To All Requires Restart
If you always have the same email recipient lists for your projects, this button may be the right thing for you.
It creates a new mail compose window with to, cc, bcc filled with names from the currently viewed email, but empty body, subject.
Reply As Original Recipient Requires Restart
Reply with the From: field set to the To: field from the original email.
Reply To All Reminder Requires Restart
Asks for confirmation when "Reply" instead of "Reply to All" is pressed on an email with multiple recipients.
Checkbox Column Requires Restart
Adds a custom column to Thunderbird's messages list (thread tree), making it easier to select multiple messages on devices with a touchscreen display.
Image Zoom (ugly fixes) Requires Restart
An ugly attempt at fixing Image Zoom
LookOut (fix version) Requires Restart
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Support: Thunderbird and SeaMonkey
Lowercase Email Addresses in Message Headers Requires Restart
Shows lowercase email addresses in message headers and their tooltips.
Sender Frequency Requires Restart
Adds a custom column for Sender Frequency to the thread pane