Folders and Filters
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Folder Filters Button Requires Restart
Just a very simple add-on that adds a toolbar button to execute the "Run Filters on Folders" from Tools menu.
Folder Levels Requires Restart
Rank your email folders by how much you care about them, and hide the ones you don't need right now.
folderplus Requires Restart
This extension adds some basic missing features about folders.
Move mails to their conversation folder. Navigate to folder with new keyboard shortcuts.
Rethread
This addon adds an entry in the right-click menu which re-threads selected messages together (groups selected messages into the same thread)". This is done by _modifying_ messages; the author of the addon declines any responsibility for data loss.
Collapsed Unread Requires Restart
Shows unread email count for collapsed folders even if the unread mails are in subfolders.
CapsKiller Requires Restart
Caps Killer is a protection against newbies using caps in their mails.
Gravatars Requires Restart
Show a column with the Gravatar-picture and sender-name in email folders.
SmartFilters Requires Restart
Tired of writing a lot of filters? Install SmartFilters now to organise your mailbox automatically. It can sort out your mailing lists and robot emails.
SavedSearchInSubFolders Requires Restart
This addon allows virtual folders (saved searches) to automatically process all subfolders of their selected target folders.
The search targets are updated automatically whenever a new folder is added, or a virtual folder is updated.
Inbox Cleaner of expired Emails Requires Restart
Moves expired Emails out of your Inbox!
Count Filters Requires Restart
This add-on provides various search filters couting values, such as total number of recipients, or number of lines, words,links in body message.
Delete Only Empty Folder Requires Restart
Disallows to delete not-empty mail folders.
Folders for search, onDisk Status- Glodaquilla-NG:
Global Search/Indexing Enhancements/ On Disk Status for IMAP
Permits selective enabling and disabling of search indexing on folders or accounts - with inheritence. Extra columns can show whether a mail is stored on disk and its indexing status.
Empty Folder
Adds a context option to mail folders for moving all included messages to trash.
Hide Email Folders
Hide Email Folders from the Folder pane (Left pane).
Note: This addon only works for Unified pane/folder mode.
Note #2: Please note that this addon only hide email folders and NOT local folders!
Special thanks to John Bieling, C-E and Alex Cabal.
NTFNTF
NTFNTF: Notify on This Folder Not That Folder. Choose to enable or disable notifications on a per-folder basis.
OpenFolder
This add-on makes it easy to open folders on a file server.
In order to use the add-on, you need to install two things: the add-on and the linked app.
You can download the linked app from the following website.
https://openfolder.net/
To create your own collections, you must have a Mozilla Add-ons account.