Remove close button firefox

remove-close-button-firefox.md

Remove close button firefox

Enable userChrome customization

1. open firefox
2. goto about:config
3. set toolkit.legacyUserProfileCustomizations.stylesheets to true

Create the directory and its files

find the Profile Directory path on about:support

1. create a new directory named chrome inside <profile-directory>
2. inside chrome directory, create 2 files userChrome.css userContent.css

Add custom css to remove close button

add css below to userChrome.css

.titlebar-buttonbox-container,
.titlebar-spacer {
  display: none;
}