make few tabs go offline

Good if you can expose public API for add ons or add this functionality 
in the main browser:

  way to make a particular tab offline in firefox for desktop.  that 
page would stop loading or if loaded no more meta refreshes/ ajax calls. 
maybe switch off all the timers so meta refresh and ajax are switched 
off (and stop all requests that are in progress for that page - AJAX or 
downloading/ any connection of the main site or include) . maybe 
downloading a file should be a special exception. but a way to stop 
downloading elements of the page like images, scripts, css, media

Also all tabs except current, all tabs to the right of current.

Why : CPU, net bandwidth saved for other things.