- args: [ '--disable-gpu', '--window-size=1280,1024' ],
+ args: [ '--disable-gpu', windowSizeArg ],
+ prefs
+ }
+ },
+ {
+ 'browserName': 'firefox',
+ 'moz:firefoxOptions': {
+ binary: '/usr/bin/firefox-developer-edition',
+ args: [ '--headless', windowSizeArg ],
+