Download theme here.
- Go to
about:support
in Firefox. - Application Basics > Profile Directory >
Open Directory
. - Create a
chrome
directory if it doesn't exist or remove/move all files inchrome
directory if they exist. - Put
mono-firefox-theme
,userChrome.css
,userContent.css
inchrome
folder. - Set
toolkit.legacyUserProfileCustomizations.stylesheets
andsvg.context-properties.content.enabled
inabout:config
totrue
. - Restart Firefox.
To switching the light or dark theme use Night Theme Switcher (choose the MonoTheme
for day and MonoThemeDark
for night variant in the Themes
tab and change the theme color by switching style in Settings > Appearance
).
- Go to
about:support
in Firefox. - Application Basics > Profile Directory >
Open Directory
. - Remove a
chrome
directory or remove files inside.