preview:

new tab

go to about:config in your browser
change toolkit.legacyUserProfileCustomizations.stylesheets to true
create dir named chrome and put theme files there
- path on windows: C:\\Users\\username\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\*release\\chrome
- path on linux(firefox native): ~/.mozilla/firefox/*release/chrome
- path on linux(snap): ~/snap/firefox/common/.mozilla/firefox/*release/chrome

Name	Name	Last commit message	Last commit date
Latest commit History 22 Commits 22 Commits
README.md	README.md
backround.png	backround.png
backround_private.png	backround_private.png
userChrome.css	userChrome.css
userContent.css	userContent.css