web browsers - fits with others exist, sharing a goal, and finding your way if not afraid of spiders.
Casually employing the descriptions:
Chrome - to cover with the element chromium, so perhaps a chemist.
Safari - a hunter may be employed on this.
Firefox - another name for the red panda, an endangered species, though common in zoos.
Opera - a singer will be employed here.
Internet explorer - explorer being the adventurer (maybe being edged out by MS, so ex).