requestAnimationFrame is not defined

[xtuc]

From our frontend JavaScript tracker:

ReferenceError: requestAnimationFrame is not defined
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 493219 in e.scheduleUpdate
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 619679 in t.value
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 619312 in t.value
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 618937 in t.value
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 205722 in e.notifyAll
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 594396 in r.close
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 88476 in r.closeAll
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 87971 in r.perform
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 212410 in s
File https://contributor.ninja/static/js/main.098f5c9b.js line 1 col 87888 in r.perform

UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36