Bug 1666610 - [BFCache] disable test_bug607529.html because it uses bfcache, r=farre

Differential Revision: https://phabricator.services.mozilla.com/D91052

layout/base/tests/mochitest.ini

@@ -67,6 +67,7 @@ fail-if = (xorigin && fission)
 support-files =
   file_bug607529.html
   file_bug607529-1.html
+skip-if = fission # bug 1666610
 [test_bug629838.html]
 skip-if = toolkit == 'android' # android: Requires plugin support
 [test_bug644768.html]