1. Firefox may support this feature in version 58+, so wait. Check this page for more info.
2. Old add-on don't support the newest firefox 57.
3. Wait or try Chrome

Edited by Chdslv at 2017-12-4 00:23

Have a look here, and at the reply from o4is. https://bbs.deepin.org/post/148923#page%3D1We can get the Firefox's top caption bar undecorated this way, but you won't see any minimize, maximize, close buttons.

thanks for the reply i saw the link it seems very deficult methood i am very new to linux i can't even install a program using terminal

what page should i check

https://www.reddit.com/r/firefox/comments/7018zq/hide_caption_titlebar_plus_alternative/

this one, don't know why it disappeared.