The new extension button introduced in Bug 1777483 should be hidden when there is no visible extension. In order to fully fix this bug, we should listen to some events to know when an extension is added/disabled/removed to make sure the button is only visible when there are visible extensions AND hide this button when there is no visible extension anymore (e.g., the user had only 1 extension enabled and removed it).
Bug 1778684 Comment 0 Edit History
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The new extension button introduced in Bug 1777481 should be hidden when there is no visible extension. In order to fully fix this bug, we should listen to some events to know when an extension is added/disabled/removed to make sure the button is only visible when there are visible extensions AND hide this button when there is no visible extension anymore (e.g., the user had only 1 extension enabled and removed it).