9 files declare their use of BlocktabsInterface in Block Tabs 8

BlockContentTab.php in src/Plugin/Tab/BlockContentTab.php

BlockTab.php in src/Plugin/Tab/BlockTab.php

Blocktabs.php in src/Entity/Blocktabs.php

TabAddForm.php in src/Form/TabAddForm.php

TabDeleteForm.php in src/Form/TabDeleteForm.php

TabEditForm.php in src/Form/TabEditForm.php

TabFormBase.php in src/Form/TabFormBase.php

TabInterface.php in src/TabInterface.php

ViewsTab.php in src/Plugin/Tab/ViewsTab.php