Message and News Reading
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XNote++
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Persistent sticky notes associated to emails. You can fulltext search with constraints/email them/print/bookmark/copy to clipboard.
If you have a large screen, you can even display the notes outside of TB's main window, so it won't hide anything.
Thunderbird Conversations
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This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.
To create your own collections, you must have a Mozilla Add-ons account.