diff --git a/common/content/configbase.js b/common/content/configbase.js
index c75ea6d0..4f8282f0 100644
--- a/common/content/configbase.js
+++ b/common/content/configbase.js
@@ -120,7 +120,14 @@ const configbase = { //{{{
      *    application namespaces which should be loaded before liberator
      *    initialization.
      */
-    scripts: []
+    scripts: [],
+
+    /**
+     * @property {string} The leaf name of any temp files created by
+     *     {@link io.createTempFile}.
+     */
+    get tempFile() this.name.toLowerCase() + ".tmp"
+
 }; //}}}
 
 // vim: set fdm=marker sw=4 ts=4 et:
diff --git a/common/content/io.js b/common/content/io.js
index 5b6ebfa1..38bf5915 100644
--- a/common/content/io.js
+++ b/common/content/io.js
@@ -704,25 +704,9 @@ function IO() //{{{
          */
         createTempFile: function ()
         {
-            let tmpName = EXTENSION_NAME + ".tmp";
-
-            switch (EXTENSION_NAME)
-            {
-                case "muttator":
-                    tmpName = "mutt-ator-mail"; // to allow Vim to :set ft=mail automatically
-                    break;
-                case "vimperator":
-                    try
-                    {
-                        if (window.content.document.location.hostname)
-                            tmpName = EXTENSION_NAME + "-" + window.content.document.location.hostname + ".tmp";
-                    }
-                    catch (e) {}
-                    break;
-            }
-
             let file = services.get("directory").get("TmpD", Ci.nsIFile);
-            file.append(tmpName);
+
+            file.append(config.tempFile);
             file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0600);
 
             return file;
diff --git a/muttator/content/config.js b/muttator/content/config.js
index 1ddfbc31..13bc91f9 100644
--- a/muttator/content/config.js
+++ b/muttator/content/config.js
@@ -161,6 +161,9 @@ const config = { //{{{
         "tabs.js"
     ],
 
+    // to allow Vim to :set ft=mail automatically
+    tempFile: "mutt-ator-mail",
+
     init: function ()
     {
         // don't wait too long when selecting new messages
diff --git a/vimperator/content/config.js b/vimperator/content/config.js
index a8972197..a4de986b 100644
--- a/vimperator/content/config.js
+++ b/vimperator/content/config.js
@@ -141,6 +141,18 @@ const config = { //{{{
         "tabs.js"
     ],
 
+    get tempFile() {
+        let prefix = this.name.toLowerCase();
+
+        try
+        {
+            prefix += "-" + window.content.document.location.hostname;
+        }
+        catch (e) {}
+
+        return prefix + ".tmp";
+    },
+
     init: function ()
     {
         // TODO: support 'nrformats'? -> probably not worth it --mst