HowTo: Firefox Custom User Colors / Remove Tabs

README.md

Go to:

• about:config

  • Set:
  • toolkit.legacyUserProfileCustomizations.stylesheets true

• go to about:profiles

  • Create a folder chrome in Root location pointed by active profile (ex. default-esr, default)
    • Create chrome/userChrome.css file

Removing Tabs (can use Sidebery)

paste into userChrome.css (if this doesn't work, rename to userContent.css)

#tabbrowser-tabs { visibility: collapse !important; }
#TabsToolbar-customization-target { visibility: collapse !important; }

(restart firefox)