Please make multirow tabs a builtin in feature. I have tried several patches but eventually gave up on multirow fixes because firefox updates keeps breaking them.
It was bad enough that you had to change about:config settings to fix this issue. Now this option will no longer work. Its pretty obvious people do not want this extension button. Why is the Firefox team so invested in this button?
There is no good reason that the extension button cannot be removed from the toolbar. The user should be able to decide what they want displayed. This is a feature no one asked for.