Richard, the button was added for keyboard accessibility since the shortcut/access key was removed; the "+" key doesn't fulfil that requirement. How about just restoring established TB 60 functionality here and leaving experiments for later?
Bug 1625263 Comment 26 Edit History
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Richard, the button was added for keyboard accessibility since the shortcut/access key was removed; the "+" button doesn't fulfil that requirement, or does hitting "+" trigger it? How about just restoring established TB 60 functionality here and leaving experiments for later?