Bug 1654971 - disable browser_toggleMode_2.js on mac os for frequent failures. r=intermittent-reviewers,jmaher

Differential Revision: https://phabricator.services.mozilla.com/D104911

toolkit/components/pictureinpicture/tests/browser.ini

@@ -71,7 +71,9 @@ skip-if = (os == 'linux' && bits == 64) || (os == 'mac' && !asan && !debug) # Bu
 [browser_toggleButtonOverlay.js]
 skip-if = true # Bug 1546455
 [browser_toggleMode_2.js]
-skip-if = (os == 'linux') # Bug 1654971
+skip-if = 
+  os == 'linux' # Bug 1654971
+  os == 'mac' && webrender  # Bug 1654971
 [browser_toggleOnInsertedVideo.js]
 [browser_toggleOpaqueOverlay.js]
 skip-if = true # Bug 1546455