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I'm using BetterBird and this add-on doesn't seem to be working for me. I do not see the button "Mark" appear on the top right of the screen. I just can't highlight anything. The add-on does appear in my settings correctly.

Post-Review Comment: The developer's suggestion worked! I have now changed my rating to reflect this outcome.

Questa recensione riguarda una versione precedente (6.0.0) del componente aggiuntivo. 

In some cases the button does not appear automatically after the Add-on installation (I don’t know why). Then you can right-click on the toolbar, choose “Customize …”, then the Mark button should appear in the list and can be dragged to the toolbar.