Although Firefox 64.0 should support dark mode on macOS Mojave it appears it's not exactly so, and instead Firefox just get a dark theme. If you enable dark mode in Mojave and use the default theme in Firefox you get a dark UI but if, for example, you chose the file/open menu you see the file requester is not dark at all. This is not how proper dark mode should work in macOS, any plan to implement it correctly?