I just discovered in #Firefox you can disable the titlebar by going to "customize" and hitting the bottom-left "titlebar" checkbox. (It's free real estate)
Come on, Ruben! Icecat 60 would be a dream for us #GuixSD users!
@MutoShack You may also like pressing F11
Fullscreen mode is nice for when I'm *only* browsing the web, but usually I enjoy being able to click on icons in the panel (taskbar, dock, I don't know the standard name) so I tend to just keep it maximized instead of fullscreen.
functional.cafe is an instance for people interested in functional programming and languages.