pumpkin-lantern.png - http://iconshow.me/pumpkin-lantern-icon   [free for personal use]
pumpkin.png -  http://iconshow.me/pumpkin-icon-3  [free]
halloween.png - http://iconshow.me/halloween-icon  [Free for commercial use - aha-soft]
firefox-ag-32.png - based on https://pixabay.com/en/firefox-fox-browser-logo-icon-303322/ [CC0 Public Domain]
mozilla-32.pmg - http://www.iconsdb.com/maroon-icons/mozilla-icon.html [CC0 1.0 Universal (CC0 1.0) Public Domain]