TITLE BAR REMOVED IN FIREFOX 
A year ago in other publication We explain how to disable title bar in Firefox, but those instructions are no longer valid for the current version of Deepin incorporating your new window manager dae-kwin, then we present the new method.
one-) Preferences install KDE by opening a terminal and run the following command:
sudo apt install systemsettings
two-) Open Firefox> Select the menu icon in the upper right part of the program (the menu icon has a form of three stripes)> Customize (or Customize)> on the bottom left, disable the "Title Bar option (or" title Bar ")
3-) Download the following rules file window "Firefox - Remove bar título.kwinrule"And save it to Desktop.
Thank you very much, very useful this information !!!
How good! Thank you! 🙂
Eu Quero know how to place esses efeitos face janelas nas no video, esses efeitos da Janela lembra or compiz appears.
Thanks for making it so easy. Excellent.