diff --git a/src/userChrome/00-header.css b/src/userChrome/00-header.css
new file mode 100644
index 0000000..acd5e7f
--- /dev/null
+++ b/src/userChrome/00-header.css
@@ -0,0 +1,4 @@
+/* WARNING: DO NOT EDIT THE COPY OF THIS FILE LOCATED IN YOUR USER PROFILE!
+   It will be overwritten on upgrade. You should edit the file located in
+   /etc/mobile-config-firefox/ instead (most package managers won't replace
+   files under /etc if they've been edited) */