The easiest and fastest way to view a website's cached version is by using WebCache. With this browser extension, you can view the cached version of websites, just by clicking on the extension icon. This is the best way to check if the website is down or not, and if it is, you can easily get the cached version of the website.

If you want to use WebCache, you have to set it as the primary cache in the options page of the browser extension. This way, it'll be the first thing that gets loaded when you visit the website.

There are a lot of options you can play with when it comes to caching websites. For example, you can set the cache time, the number of views, and whether you want to check for changes or not.