diff --git a/common/modules/buffer.jsm b/common/modules/buffer.jsm
index e2cabf61..4ed94c50 100644
--- a/common/modules/buffer.jsm
+++ b/common/modules/buffer.jsm
@@ -2439,4 +2439,4 @@ Buffer.addPageInfoSection("s", "Security", function (verbose) {
 
 endModule();
 
-// vim: set fdm=marker sw=4 ts=4 et:
+// vim: set fdm=marker sw=4 ts=4 et ft=javascript:
diff --git a/common/modules/help.jsm b/common/modules/help.jsm
index 641086b7..4f2e46a7 100644
--- a/common/modules/help.jsm
+++ b/common/modules/help.jsm
@@ -457,4 +457,4 @@ var Help = Module("Help", {
 
 endModule();
 
-// vim: set fdm=marker sw=4 ts=4 et:
+// vim: set fdm=marker sw=4 ts=4 et ft=javascript:
diff --git a/common/modules/protocol.jsm b/common/modules/protocol.jsm
index ba02a156..6b938f3e 100644
--- a/common/modules/protocol.jsm
+++ b/common/modules/protocol.jsm
@@ -252,4 +252,4 @@ XMLChannel.prototype = {
 
 endModule();
 
-// vim: set fdm=marker sw=4 ts=4 et:
+// vim: set fdm=marker sw=4 ts=4 et ft=javascript: