mozilla/butter — pull request #1325 by cadecairos (2012-11-01 21:00:59+00:00)
Title: [#2737] Add ua-parser library for more robust user agent detection.

Lighthouse: https://webmademovies.lighthouseapp.com/projects/65733/tickets/2737-differences-in-ua-string-composition-problem-for-ua-warning-dialog