Nope, it just that older extensions will and IIRC the developer of the tree-style-tabs extension was really vocal about the fact that he disliked the new API. H

Nope, it just that older extensions will and IIRC the developer of the tree-style-tabs extension was really vocal about the fact that he disliked the new API. He had claimed it would be impossible to port his extension to the new system. I'm not clear on the history of it all, so I don't know if it was possible at the time or not.