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Mozilla, let us remove the Extension Button from the toolbar! : r/firefox
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Mozilla Firefox 57+ : custom toolbar is still supported but how to manage it? - Super User
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Reinstalled Firefox after hard drive failure...Where did my Firefox Toolbar buttons for UBlock Origin, Pushbullet, and other extensions go? How do I get them back? : r/firefox
Mozilla Firefox 57+ : custom toolbar is still supported but how to manage it? - Super User