gleero/grunt-favicons — pull request #14 by ro-ka (2013-12-18 09:52:21+00:00)
Title: Add Firefox icon 120x120

Dammit, Firefox raises a warning if this is missing, too. They could've shown that warning before next to the 90x90 warning.

But I build my app again with the 120x120 icon and now there aren't any warnings anymore.