anchor.diff:      (when style-sheet
         (setf (gethash message-params %style-sheets%)
               style-sheet))
  -    ""))
  +    "null"))
   
   (-> tabs-remove-css (string) string)
   (defun tabs-remove-css (message-params)
  
positive.code:                                  (string= (gethash "runAt" script-data) "document_start"))
         :all-frames-p (gethash "allFrames" script-data)
         :world-name (name extension)))
      ""))
  
  (-> storage-local-get (buffer string) (values string &optional))
  (defun storage-local-get (buffer message-params)
  
negative.code:          (style-sheet (gethash message-params %style-sheets%)))
      (ffi-buffer-remove-user-style buffer-to-remove style-sheet)
      (remhash message-params %style-sheets%)
      "null"))
  
  (-> tabs-execute-script (buffer string) string)
  (defun tabs-execute-script (buffer message-params)
  