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Search Results Sort By Date Not Relevance
Requires Restart
Makes search results sort by "date" instead of "relevance" by default.
German dictionary (de_CH)
German dictionary igerman98 (de_CH, Switzerland), for Firefox, Thunderbird und Seamonkey.
German Dictionary (de-DE), classical and reformed
German Dictionary according to the classical or reformed spelling standards for spell-checking in Firefox and Thunderbird ++
Deutsches Wörterbuch nach den bewährten oder reformierten Regeln für die Rechtschreibprüfung in Firefox und Thunderbird
Norsk bokmål ordliste
Norsk bokmål ordliste for Mozilla Firefox, Mozilla Thunderbird og SeaMonkey.
IMAP Quota (Free Space)
Requires Restart
This Thunderbird addon lets you customize the IMAP quota statusbar panel.
Bengali (Bangladesh) Dictionary
ThunderLink
Requires Restart
Clickable, durable links to specific messages inside Thunderbird.
Hide Local Folders
Requires Restart
Removes the "Local Folders" entry from the folder pane.
TexTra
IMAP Received Date
Requires Restart
Make the “Received” column in IMAP folders show when messages were actually received.
Hindi Spell Checker
This is a real time spell checker for Hindi, supported on Firefox,
Thunderbird, and Seamonkey.
LaTeX It!
Requires Restart
This addons allows you to write LaTeX expressions in your emails such as $x^2$ or $$\sum_{x=0}\infty$$ and have them all replaced by a PNG image with the corresponding formula inside.
*Note: this addon is not compatible with Thunderbird 78+*
Get All Mail Button
Requires Restart
Adds a toolbar button to Get All Mail Accounts in Thunderbird.
Teamworkx Thunderbird Integration for Jira
Requires Restart
This is a add-on for Thunderbird as well as Seamonkey which is able to create Atlassian Jira issues out of e-mails or add the content of an e-mail as a comment on an Jira issue.
Hebrew spell-checking dictionary (from HSpell)
Hebrew spell-checking dictionary for Firefox and Thunderbird. Generated from data of the HSpell project version 1.4, and distributed freely under the AGPLv3.
Menu On Top (SuperMenu Avatar)
Requires Restart
Move the Thunderbird menu bar to the top. Choose from a selection of visual styles + colors. Add frequently used bookmarks and an avatar icon without wasting precious screen space. Bookmark your favorite sites, emails, folders or configuration pages.
Checkbox Column
Requires Restart
Adds a custom column to Thunderbird's messages list (thread tree), making it easier to select multiple messages on devices with a touchscreen display.
To create your own collections, you must have a Mozilla Add-ons account.
