I am using Firefox 41.0.1 in Ubuntu 15.04. When I lose internet connection without noticing, then click on a link I'll get a "Server not found" message. Is there a way to go back to the previous page? The "go back" button doesn't work because Firefox tries to reload the page instead of using the cached content.
You can use this Firefox add-on, https://addons.mozilla.org/en-us/firefox/addon/cachemachine/, or this other one, https://addons.mozilla.org/en-US/firefox/addon/cacheviewer/.