Google caches all websites and pages of a site when it crawls it with its bots. Most cached pages are then linked to from Google Search as well which can be handy at times, for instance if a website is not responding or down.
The cached version provides access to the website's contents even if it is not accessible at the time.
Google's cache is not the only option if you need to access the contents of a website that is currently down (see Website blocked or slow ? Try Coral Cdn for instance).
Probably the biggest weakness of Google's Cache usability wise is that links on a cached page link to the original website and not a page's cached version in Google Cache.
If you want to read a linked page that points to the very same website that is down, you need to go back to Google and search for it to access its cached version which is not very handy. Think of a forum thread with ten pages of content, you would have to go back ten times to read all ten pages.
That's where the Google Chrome extension Google Cache Link Protector steps in. The extension converts all direct links pointing to other pages of a cached page you are visiting to Google's Cache which means that you can navigate through Google's cached version of a website directly without ever having to go back to Google Search to find cached links first.
Note that this works only for pages that Google has cached. If a page has not been cached, it cannot be accessed this way for obvious reasons.
The extension processes all links on the page and turns them into links pointing directly to the cache, provided that a cached version is available for that link. The link generation may take a moment though; it is noticeable but fast enough to not be a big distraction or slow down.
This way, you can navigate all cached pages of the website directly without having to switch to the Google Search interface again to display another cached link of the site.
Google Cache Link Protector is a handy extension for the Google Chrome browser. It is available for direct installation over at the Google Chrome Extensions Gallery.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.