Message Composition

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Highlighter Requires Restart

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (48)
9,428 users

Extra Format Buttons Requires Restart

Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.

Rated 4 out of 5 stars (11)
5,154 users

ReplyWithHeader Requires Restart

Outlook style headers and few goodies for Thunderbird & Postbox.

Rated 4 out of 5 stars (8)
1,061 users

replyTo Requires Restart

Adds a menuitem to the Mail context Menu to Reply to a different Mailadress

Rated 4 out of 5 stars (9)
212 users

Emoji Menu Requires Restart

Adds the ability to easily insert emojis into your composed messages in Thunderbird.

Rated 4 out of 5 stars (7)
4,452 users

Flexible Identity Requires Restart

Selects an identity based on the recipients list when sending an email

Rated 4 out of 5 stars (27)
1,096 users

Posting Style Enforcer Requires Restart

Automatically converts top-posted messages to use bottom-positng or vice versa. Interleaved posts are left alone. Detects automatically added text and supports a per-contact list of exceptions.

Rated 5 out of 5 stars (3)
31 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 4 out of 5 stars (10)
2,416 users

Get before Send Requires Restart

Get messages for the account which is bound to the identity then send the message when you click the toolbar button or the menu item. If your SMTP sever authenticates using POP(IMAP) before SMTP, the extension is useful.

Rated 5 out of 5 stars (2)
822 users

random(signature) Requires Restart

Updates a given signature file in regular intervals.

Rated 4 out of 5 stars (40)
304 users

Reply As Original Recipient Requires Restart

Reply with the From: field set to the To: field from the original email.

Rated 5 out of 5 stars (3)
171 users

PennyPost Requires Restart

This extension makes it very easy to generate and attach stamps to outgoing mail. It also automatically detects and verifies stamps on incoming emails. The MBound algorithm requires a 16MB fixed table to work, HashCash is more CPU intense.

Rated 5 out of 5 stars (3)
26 users

Toggle Word Wrap Requires Restart

Toggle word wrapping and PRE element wrapping in the message composition and HTML display windows, respectively.

Rated 4 out of 5 stars (43)
5,318 users

Macro Template

Macro Template is to replace mail templates with macros for date formatting.

Rated 5 out of 5 stars (2)
286 users

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.

Rated 4 out of 5 stars (6)
1,638 users

Signature Switch Requires Restart

Switch the signature on/off or choose a new one from your predefined set...

Rated 4 out of 5 stars (189)
59,384 users

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.

Rated 4 out of 5 stars (8)
3,386 users

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.

Rated 4 out of 5 stars (7)
637 users

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.

Rated 3 out of 5 stars (17)
96 users

Smart Quotes Requires Restart

Enables “Smart” Quotes for Thunderbird Email

Rated 5 out of 5 stars (2)
72 users