DISABLE AUTOMATIC WEB REFRESHING (FIREFOX)

Firefox only (Win/Mac/Linux): Have you ever noticed how some web sites automatically reload the page every minute or two? It's frustrating, unnecessary, and thankfully can be easily disabled in Firefox.

While there could be some valid reasons for reloading the page, most of the time it's just a way to artificially increase pageviews—at the cost of your bandwidth and CPU cycles. To disable the automatic refresh, you can type about:config into the location bar, and then filter by the following setting:
accessibility.blockautorefresh

Once you've found it, simply double-click on the key to change the value to false true, and web pages won't be able to reload the page. If you have the setting enabled but you'd like to make a single page refresh automatically, you can use the previously mentioned ReloadEvery extension.


Source:
http://lifehacker.com/5321420/disable-automatic-web-page-refreshing