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Metamorfik
The Altium Forums are the best way to participate in discussions, share tips, ask/answer questions and locate resources.
ThunderThings
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Context menu on message allowing quick filtering based on email/sender or domain
sms77
ReplyAsOriginalRecipientUp
When you reply to a mail sent to your personalized address (postfix/qmail/gmail extensions) such as john.doe+contactname@example.com, "From:" is replaced by your personalized address rather than your simple address.
Open in browser
A context menu item to open the links associated with feed items in the default browser and then mark them as read.
Archive old messages
A context menu item to archive all messages than older than a given duration.
BCM Bengali (Bangladesh) Spellchecker
Spellchecker for Bengali (Bangladesh) following Bangla Academy and Prothom Alo standards: See https://banglatypefoundry.com/spellchecker/
Scriptable Notifications
Allows you to define an external script (bash, batch, python, ...) which is called so you can manage mail notifications / alerts the way you want.
Snap/Flatpak versions of Thunderbird not supported.
Safelink removal
Replace URLs which have been rewritten by Office 365 Advanced Threat Protection with the original URL.
Aranese spell checker
SpamTester
SpamTester allows you to test the spam score of your email using popular anti-spam software (SpamAssassin, Rspamd...). This is useful to know if your email will fall into the recipient's spam (or even get your mail server blocked).
Balochi Spellchecker for UniBal Script
This add-on is a Balochi spellchecker based on the UniBal Balochi script.
This is a pre-beta version as the dictionary has 1000+ words and not all Balochi Affix rules are implemented.
Please use it and give your feedback
Tatar spellchecker dictionary
Tatar dictionary for spell-checking in Firefox and Thunderbird.
Орфографический словарь Firefox и Thunderbird для проверки правописания татарского языка.
Lower Sorbian dictionary
Kiswahili Spell Checker
Babyish spellchecker
FileLink Provider for Box
Uploads your large attachments to your Box instead of sending them by email.
To create your own collections, you must have a Mozilla Add-ons account.
