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Message Header Toolbar Customize
Thunderbird 78 removes customize functionality of message header view toolbar. This extension adds capability to customize the toolbar. You can do the followings:
- Change icon display
- Icons and text
- Icon only
- Text only
- Change order of buttons
- Hide unnecessary buttons
- Add Conversation, Tag and Forward As buttons
- Add space and separator
By default, it only changes the toolbar to icon only display. To customize it, open customize window by right-clicking of the toolbar or a menu in the "More" button.
See my blog post for details.