[rb] add test guard back

Author: titusfortner

rb/spec/integration/selenium/webdriver/firefox/driver_spec.rb

@@ -44,8 +44,10 @@ module Firefox
                                      page: {width: 30})).to include(magic_number)
           end
 
-          it 'prints full page', except: {platform: :windows,
-                                          reason: 'Some issues with resolution?'} do
+          it 'prints full page', except: [{platform: :windows,
+                                           reason: 'Some issues with resolution?'},
+                                          {platform: :macosx,
+                                           reason: 'showing half resolution of what expected'}] do
             viewport_width = driver.execute_script('return window.innerWidth;')
             viewport_height = driver.execute_script('return window.innerHeight;')