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Thunderkey
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).
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.
marked-lightning
Extension for Lightning: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.
Search for
Context menu on message allowing quick filtering based on email/sender or domain
Safelink removal
Replace URLs which have been rewritten by Office 365 Advanced Threat Protection with the original URL.
Aify
Rewrite or generate text based on promps using OpenAI's API.
Configure on settings page (make sure to save) and start to use when writing your emails!
You must have a payment method on record with OpenAI and an API key. OpenAI charge for use.
Aranese spell checker
sms77
AutoZoom
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.
