Fed up with websites and tabs continuously reloading themselves and using resources unnecessarily? Me too!
In Firefox, you can disable this from the about:config page. Type about:config in the address bar, accept the warning, and search for:
accessibility.blockautorefresh
Set it to true. Problem solved — pages can no longer auto-refresh without your permission.
You can also keep an eye on which tab uses the most resources by typing about:performance in the address bar. Firefox shows a list of open tabs with their CPU and memory usage, making it easy to find and close the resource hogs.
Enjoy!