Message Composition
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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。
Expand mailing lists
Adds an 'expand lists' button to the compose window. It replaces all mailing lists with their contacts.
To must occur only once
This add-on changes all but the first "to" to "cc" if there are multiple "to" when replying to an email.
stripImages
Remove all images from message with one click.
Places a "strip images" button on the toolbar of the message compose window.
Clicking the button will remove all images from the message.
This helps keep mailbox disk space down.
ReFwdFormatter
Remove the ">" prefix from quote when you make a reply.
[Source code] https://github.com/isshiki/ReFwdFormatter
Copy Message ID
Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.
PopMailListRecipients 2
Expands address book lists to recipients addresses in the compose window
Typical Reply Requires Restart
Provides ability to send/receive typical replies in a team.Provides ability to send/receive typical replies in a team.
Previous Colors
Quickly choose one of the previously selected colors for a message text
PGPGeek
Quick & easy PGP encryption / decryption tool
* Save & use many public encryption keys to encrypt mail content
* Save & use many private decryption keys to decrypt mail content
Using openPGP.js
Open Source
https://github.com/pgpgeek/pgpgeek
FileLink Provider for Box
Uploads your large attachments to your Box instead of sending them by email.
Reply to Multiple Messages Requires Restart
Add menu commands for replying to multiple messages at the same time.
FileLink Provider for Dropbox
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
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.
FileLink Provider for OwnCloud and NextCloud
Uploads your large attachments to your OwnCloud or NextCloud server and instead inserts a public link into your email.
One-by-One Forward Requires Restart
Highlight multiple emails, right-click, then select "One-by-One Forward". This extension will allow you to forward the selected emails, one-by-one, to the recipients you specify using your choice of attachment handling.
Stop Ignoring Reply:To Requires Restart
Default "Reply" functionality pays attention to "Reply-To" in original email
Resubmit Requires Restart
(Re)submit multiple messages to a predefined recipient(s)
TarotSignature Requires Restart
This version provides a custom button for the message composer.
You need to customize your toolbar of the message composer.
The signature is hard-coded into the source code.
The signature is NOT being inserted automatically on window-open.
Custom Sender Address and Reply Requires Restart
Select sender mail address based on the recipient and reply with the same address
To create your own collections, you must have a Mozilla Add-ons account.