Let me first say that there is no need to add it at all, because there is no function that users can add, and it is ironic that it is more difficult for users to install their own software than adding menu functions.
But if there is, then the UI refers to the way of firefox 49
Let me first say that there is no need to add it at all, because there is no function that users can add, and it is ironic that it is more difficult for users to install their own software than adding menu functions.
But if there is, then the UI refers to the way of firefox 49