Add-ons
Extensions by Name
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ReloadPAC
Requires Restart
Workaround for Bug 351163 (Thunderbird bypasses proxy.pac for first connection).
Remember Mismatched Domains
Requires Restart
The Remember Mismatched Domains extension for Firefox and Thunderbird adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows. When selected the domain...
ReminderFox
Requires Restart
ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.
RemindIt
Help in reminding mails to be answer or sent again. Choose a reminder date for each received or send message that are highlighted in the message list, depending on their status (expired, soon to exprire, to be reminded). Sending a reminder is eased.
RemindMe
Moves email into Inbox/RemindMe folder, and moves it back into Inbox after chosen time.
Remote Content By Folder
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.
Remove Duplicate Messages
Requires Restart
If you have duplicate messages (e.g. from merging folders or downloading messages several times) you can use this tool to find and remove them from the selected folder and its subfolder by rightclicking on a folder and choosing "Remove duplicates..."
Remove Duplicate Messages
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
Remove Duplicates
Render Markdown Messages
This extension renders markdown-formatted messages as rich text. It preserves the fonts and formatting of plain text messages but adds support for markdown features like lists, code blocks, etc.
Repeat Borders
Requires Restart
Adds darker borders to repeat events to distinguish them from single events.
Replaceholder
Replace placeholders with date and time as you type.
入力画面の件名、本文内の各プレースホルダを日時や曜日等の文字列に置換します。
Reply All Control
Requires Restart
Allows you to disable the ability to use Reply All when your email address does not appear in the To: or CC: fields. This usually means you've been BCC'd and Reply All might reveal the sender's sinister plot.
Reply As Original Recipient
Requires Restart
Reply with the From: field set to the To: field from the original email.
Reply In Group
Requires Restart
Adds "Reply In Group" and "Reply to sender" toolbar buttons to the main window. So it's easier to reply in Usenet...
Reply Monitor
Requires Restart
**This is NOT COMPATIBLE with Thunderbird 31 or newer versions**
Keep track of your emails and replies (Lightning is required).
Note: the name of this add-on has been changed to Reply Monitor because the previous name is a registered trademark.
Reply to All as Cc
Requires Restart
Send a reply for recipients as CC except the sender, when you do "Reply to All".
Reply To All Reminder
Requires Restart
Asks for confirmation when "Reply" instead of "Reply to All" is pressed on an email with multiple recipients.
Reply to Multiple Messages
Requires Restart
Add menu commands for replying to multiple messages at the same time.
Reply with subaddress
Reply to a message that was sent to a subaddess with the same address.
Example: Your primary email is [email protected], you receive a mail to the subaddress [email protected], the sender of replies is set to [email protected].
To create your own collections, you must have a Mozilla Add-ons account.
