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Ensure new browsing contexts are opened without a useful window.opener

IE Edge Firefox Chrome Safari Opera iOS Safari Opera Mini Android Browser Blackberry Browser Opera Mobile Chrome for Android Firefox for Android IE Mobile UC Browser for Android Samsung Internet QQ Browser Baidu Browser
49
56 9.3 4.4
14 52 57 10 10.0-10.2 4.4.3-4.4.4 4
11 15 53 58 10.1 44 10.3 all 56 10 37 57 52 11 11.4 5 1.2 7.12
54 59 TP 45
55 60 46
56 61

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