I've used a similar add-on for Google search (the add-on made some human-like Google searches in the background), but I can't remember its name now.
Facebook would be a pointless exercise, since the <div> names are automatically generated. You can't even hide the sidebars you never use using CSS because they'll all change their <div> IDs on refresh. That and the murkiness of what exactly is an ad on Facebook makes even the most thorough adblockers struggling to work properly even in an otherwise-ideal situation (a desktop browser with an adblocker).