tailieunhanh - Hacking Firefox - part 13

ếu bạn tham gia tập thể dục trước đây của hình ảnh chặn, bây giờ bạn có cơ hội để khôi phục lại hình ảnh cho trang web mà bạn thử nghiệm trên. Chỉ cần đánh dấu trang web đó sẽ được khôi phục và nhấn vào nút Hủy bỏ trang web. Khi bạn làm mới trang web đó đặc biệt, tất cả các yếu tố hình ảnh sẽ được khôi phục. | 122 Part II Hacking Performance Security and Banner Ads Referring to Figure 7-2 note the Exceptions button beside Load Images. Open up the Options dialog again and give that a click. This should bring up the dialog shown in Figure 7-3. Figure 7-3 Image exceptions to allow and block specific sites If you participated in the earlier exercise of blocking images now you have the opportunity to restore images to the site that you experimented on. Simply highlight the web site that should be restored and click the Remove Site button. When you refresh that particular web page all the picture elements should be restored. As previously mentioned the for the originating web site only option generally blocks too much although it does a good job of removing the majority of advertisements. The Exceptions dialog allows just that sites that should always be allowed to display pictures can be listed as well as sites that you would never want to see pictures from. Think of the originating web site only option as the paranoid approach with this on it is up to users to specify sites that they explicitly allow to pull in third-party pictures. This still does not guarantee that advertisements or inappropriate images will not sneak in might still pull in ads from which we already mentioned is not blocked and visiting will still load inappropriate images from that particular domain. Leaving off the originating web site only option would be a more optimistic approach and instead of the white list approach previously outlined this still requires the user to maintain a blacklist of what sites to block. Neither approach is perfect and both approaches require a fairly significant amount of vigilance on the part of the user but they do offer a start in filtering unwanted images. Chapter 7 Hacking Banner Ads Content Images and Cookies 123 Using Built-in Content Handling to Block Ads Blocking out advertisements based on very specific