Firefox will remove the "full version" of the skin and only make "tiny" in the future"
Currently, firefoxfirefox has two types of skin: one is the "heavyweight" Full Edition skin and the other is the "lightweight" skin. Simply put, the full version of the skin can affect almost any interface, including color, button size, and Tab location. The lightweight skin only modifies the basic interface and browser framework background, and buttons and tabs cannot be modified. Mozilla officially decided to completely remove the full version of the skin, only keep the "lightweight" settings.
There is a reason for Mozilla to do this. If it is a full version of the skin, it is necessary to modify more code, and Firefox engineers also need to set up more interfaces to make these skins usable. Therefore, security and stability are not a good choice. So in the future, Firefox browsers will only be able to be "tiny", but some functions of the original full version of the skin will be transplanted to the "lightweight" skin.
At present, Mozilla has not yet given a specific date to completely stop the full version of the skin, but in fact this does not affect most users, because there are not many users using this function.