diff --git a/README.md b/README.md
index 1460609..51e5a16 100644
--- a/README.md
+++ b/README.md
@@ -96,8 +96,15 @@ automatically setup these arbitrary injections.
     - `programs.bash.loginExtra`
     - `programs.bash.logoutExtra`
     - `programs.bash.profileExtra`
-* Firefox (css language)
+* Firefox and its forks (css language)
     - `programs.firefox.profiles.*.userChrome`
+    - `programs.firefox.profiles.*.userContent`
+    - `programs.floorp.profiles.*.userChrome`
+    - `programs.floorp.profiles.*.userContent`
+    - `programs.librewolf.profiles.*.userChrome`
+    - `programs.librewolf.profiles.*.userContent`
+    - `programs.thunderbird.profiles.*.userChrome`
+    - `programs.thunderbird.profiles.*.userContent`
 * Wezterm (lua language)
     - `programs.wezterm.extraConfig`
 </details>
diff --git a/queries/nix/injections.scm b/queries/nix/injections.scm
index c7e0618..51a7361 100644
--- a/queries/nix/injections.scm
+++ b/queries/nix/injections.scm
@@ -90,9 +90,9 @@
   (#set! injection.combined)
 )
 
-; Firefox
+; Firefox and its forks
 (binding
-  attrpath: (_) @_path (#hmts-path? @_path "programs" "firefox" "profiles" ".*" "userChrome")
+  attrpath: (_) @_path (#hmts-path? @_path "programs" "(firefox|floorp|librewolf|thunderbird)" "profiles" ".*" "userC(hrome|ontent)")
   expression: (_ (string_fragment) @injection.content)
   (#set! injection.language "css")
   (#set! injection.combined)