Alex, those changes just disable a test and prevents it from running because of a high failure rate on linux. I don't see how that could impact browser performance as it's just for CI reasons, it doesn't change behavior for users, and is not to have so many failures in Treeherder. Most likely the regressor is somewhere else and I think this one is very likely candidate: https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=testfailed%2Cbusted%2Cexception&revision=614f785903275dba64ad243937543112b4912849
Bug 1760085 Comment 193 Edit History
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Alex, those changes just disable a test and prevents it from running because of a high failure rate on linux. I don't see how that could impact browser performance as it's just for CI reasons, it doesn't change behavior for users, and is not to have so many failures in Treeherder. Most likely the regressor is somewhere else and I think this one is a very likely candidate: https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=testfailed%2Cbusted%2Cexception&revision=614f785903275dba64ad243937543112b4912849