documentcloud/underscore — comment on commit e801de0e6c69986a36ee4b1335a1a4d9a5c9caea
File: underscore.js line 141
By jdalton:

Tweak comment as Opera 11.60 came out and doesn't have this issue:
`// Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1`