blueimp/jQuery-File-Upload — pull request #3281 by cbauden (2014-08-06 10:46:45+00:00)
Title: FF text disappear on tabbing on button fix

on Firefox when tabbing (keyboard user) onto the file-input-button the text on the button disappear.
change the font-size to 20px fixe the issue and still behaves the same on other browser
NOTE: Tabbing + enter on IE does not open the explorer window