diff --git a/firefox/README.md b/firefox/README.md
index 07440ad..55d830e 100644
--- a/firefox/README.md
+++ b/firefox/README.md
@@ -1,6 +1,12 @@
 # Firefox
 
+## userChrome
+
 1. Set `toolkit.legacyUserProfileCustomizations.stylesheets` to `true` with `about:config`
 1. Locate profile with `about:profiles`
 1. Copy `firefox/userChrome.css` to `{Root Directory}/chrome/userChrome.css`
 1. Customize interface
+
+## userStyles
+
+Styles can be applied using the [CSS Override extension](https://github.com/swcolegrove/css-override-web-extension).
diff --git a/firefox/configs-treestyletab@piro.sakura.ne.jp.json b/firefox/treestyletab/configs-treestyletab@piro.sakura.ne.jp.json
similarity index 100%
rename from firefox/configs-treestyletab@piro.sakura.ne.jp.json
rename to firefox/treestyletab/configs-treestyletab@piro.sakura.ne.jp.json
diff --git a/firefox/treestyletab.css b/firefox/treestyletab/treestyletab.css
similarity index 100%
rename from firefox/treestyletab.css
rename to firefox/treestyletab/treestyletab.css
diff --git a/userStyles/lemmy.css b/firefox/userStyles/lemmy.css
similarity index 100%
rename from userStyles/lemmy.css
rename to firefox/userStyles/lemmy.css
diff --git a/userStyles/zulip.css b/firefox/userStyles/zulip.css
similarity index 100%
rename from userStyles/zulip.css
rename to firefox/userStyles/zulip.css
diff --git a/firefox/vimium-options.json b/firefox/vimium/vimium-options.json
similarity index 100%
rename from firefox/vimium-options.json
rename to firefox/vimium/vimium-options.json