FF38+ gives you a popup if it detects an addon is slowing page render: http://www.ghacks.net/2015/02/18/firefox-38-notifies-you-about-add-ons-that-slow-down-the

FF38+ gives you a popup if it detects an addon is slowing page render: http://www.ghacks.net/2015/02/18/firefox-38-notifies-you-about-add-ons-that-slow-down-the-browser/ http://www.ghacks.net/2015/02/18/firefox-38-notifies-you-abo...