Backed out 1 changesets (bug 1674519) for perma-failing bug 1667271 . CLOSED TREE

Backed out changeset 8a63650b41c4 (bug 1674519)

docshell/test/mochitest/mochitest.ini

@@ -100,7 +100,6 @@ skip-if = fission # bug 1666449
 [test_bug668513.html]
 support-files = file_bug668513.html
 [test_bug669671.html]
-skip-if = fission # Bug 1674519
 [test_bug675587.html]
 support-files = file_bug675587.html
 [test_bug680257.html]