Backed out changeset fed3a10c6ffc (bug 1397229)

browser/base/content/test/performance/hidpi/browser.ini

@@ -3,4 +3,4 @@ prefs =
   layout.css.devPixelsPerPx='2'
 
 [../browser_startup_images.js]
-skip-if = !debug || (os == 'win' && (os_version == '6.1' || os_version == '10.0'))  # hidpi results in the toolbar overflowing on Win 7; fails on Win 10 (bug 1400357)
+skip-if = !debug || (os == 'win' && os_version == '6.1') # hidpi results in the toolbar overflowing on Win 7