Bug 1556066 - Disable browser_bug817947.js on linux64 for frequent failures r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D41802

--HG--
extra : moz-landing-system : lando

browser/base/content/test/general/browser.ini

@@ -222,6 +222,7 @@ uses-unsafe-cpows = true
 [browser_bug767836_perwindowpb.js]
 # DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.
 [browser_bug817947.js]
+skip-if = os == 'linux' && !debug && bits == 64 # Bug 1556066 
 # DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.
 [browser_bug832435.js]
 # DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.