Use console.error instead of console.log.

src/features.coffee

@@ -408,7 +408,7 @@ Settings =
           window.location.reload()
       catch err
         output.textContent = 'Import failed due to an error.'
-        c.log err.stack
+        c.error err.stack
     reader.readAsText file
   loadSettings: (data) ->
     version = data.version.split '.'

src/main.coffee

@@ -554,7 +554,7 @@ Main =
 
   parseError: (data) ->
     {message, error} = data
-    c.log message, error.stack
+    c.error message, error.stack
     message = $.el 'div',
       textContent: message
     error = $.el 'div',