Toggle Word Wrap Requires Restart
Toggle word wrapping and PRE element wrapping in the message composition and HTML display windows, respectively.
Markdown Here Requires Restart
Write your email in Markdown, then make it pretty.
Grammar Checker Requires Restart
Checks grammar using LanguageTool.
MEGAbird Requires Restart
Add MEGA support to Thunderbird's Filelink feature.
Attach from Clipboard Requires Restart
Create file attachments directly from the system clipboard.
Allows you to use your Exchange email accounts that use Outlook Web Access (OWA) with Thunderbird
NestedQuote Remover Requires Restart
Remove nested quotes when replying to a mail.
Address bulk copy （アドレス一括コピー） Requires Restart
Thunderbird は Outlook のようにアドレス全選択からの「一括コピー」ができません。
EnForward Requires Restart
Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).
This function can be invoked by "Forward to Evernote" in the context menu.
Flexible Identity Requires Restart
Selects an identity based on the recipients list when sending an email
BorderColors D Requires Restart
Shows a colorful border around the "New Message" window, so you can tell different identities apart.
Builds on the original BorderColors and the "GT" version, adding different border styles.
Extra Format Buttons Requires Restart
Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.
SMTP Switch Reborn Requires Restart
SubSwitch Requires Restart
Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.
BorderColors GT Requires Restart
How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.
Reply to Multiple Messages Requires Restart
Add menu commands for replying to multiple messages at the same time.
X-Unsent support Requires Restart
Adds support for the X-Unsent header.
Reply to All as Cc Requires Restart
Send a reply for recipients as CC except the sender, when you do "Reply to All".
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
Stop Ignoring Reply:To Requires Restart
Default "Reply" functionality pays attention to "Reply-To" in original email