anchor.diff:  (defmethod initialize-instance :after ((buffer web-buffer) &key)
     (when (expand-path (cookies-path buffer))
       (ensure-parent-exists (expand-path (cookies-path buffer)))))
  +
  +(define-class nosave-buffer (user-web-buffer)
  +  ((data-profile (make-instance 'nosave-data-profile))
  +   (default-modes '(reduce-tracking-mode certificate-exception-mode
  +                    web-mode base-mode)))
  +  (:export-class-name-p t)
  +  (:export-accessor-names-p t)
  +  (:export-predicate-name-p t)
  +  (:accessor-name-transformer (hu.dwim.defclass-star:make-name-transformer name)))
  +
  +(define-user-class nosave-buffer)
   
   (define-class internal-buffer (user-buffer)
     ((style #.(cl-css:css
  
positive.code:                                    (:data-profile data-profile)
                                     (:default-modes list)
                                     (:dead-buffer buffer)
                                     (:internal-buffer-p boolean)
                                     (:parent-buffer buffer)
                                     (:no-history-p boolean)))
                  buffer-make))
  (defun buffer-make (browser &key data-profile title default-modes
                                dead-buffer internal-buffer-p parent-buffer
                                no-history-p)
    "Make buffer with title TITLE and modes DEFAULT-MODES.
  Run `*browser*'s `buffer-make-hook' over the created buffer before returning it.
  If DEAD-BUFFER is a dead buffer, recreate its web view and give it a new ID."
  
negative.code:                        ;; Dead buffer ID must be renewed before calling `ffi-buffer-make'.
                         (setf (id dead-buffer) (get-unique-buffer-identifier *browser*))
                         (ffi-buffer-make dead-buffer))
                       (apply #'make-instance (cond
                                                (internal-buffer-p 'user-internal-buffer)
                                                (nosave-buffer-p 'user-nosave-buffer)
                                                (t 'user-web-buffer))
                              :id (get-unique-buffer-identifier *browser*)
                              (append (when title `(:title ,title))
                                      (when default-modes `(:default-modes ,default-modes))
  