diff --git a/tests/modules/programs/firefox/profiles/userchrome/chrome/extraFile.css b/tests/modules/programs/firefox/profiles/userchrome/chrome/extraFile.css
new file mode 100644
index 000000000..17e84dfe4
--- /dev/null
+++ b/tests/modules/programs/firefox/profiles/userchrome/chrome/extraFile.css
@@ -0,0 +1,3 @@
+/*
+* A file that might be imported from the main css
+*/
diff --git a/tests/modules/programs/firefox/profiles/userchrome/default.nix b/tests/modules/programs/firefox/profiles/userchrome/default.nix
index f1b1482b5..113a017af 100644
--- a/tests/modules/programs/firefox/profiles/userchrome/default.nix
+++ b/tests/modules/programs/firefox/profiles/userchrome/default.nix
@@ -48,14 +48,20 @@ in
 
         assertDirectoryExists home-files/${cfg.configPath}/basic
 
+        assertFileNotExists \
+          home-files/${cfg.configPath}/lines/chrome/extraFile.css
         assertFileContent \
           home-files/${cfg.configPath}/lines/chrome/userChrome.css \
           ${./chrome/userChrome.css}
 
+        assertFileNotExists \
+          home-files/${cfg.configPath}/path/chrome/extraFile.css
         assertFileContent \
           home-files/${cfg.configPath}/path/chrome/userChrome.css \
           ${./chrome/userChrome.css}
 
+        assertFileExists \
+          home-files/${cfg.configPath}/folder/chrome/extraFile.css
         assertFileContent \
           home-files/${cfg.configPath}/folder/chrome/userChrome.css \
           ${./chrome/userChrome.css}