I have not tested it with Firefox or IE... mainly because we have safe search enforcement set in Chrome via Windows Group Policy. Firefox, does not have really policy support, and I don't think the IE GPO has a setting for safe search enforcement. I can replicate this every time where it works fine in Chrome 69, and as soon as I upgrade to Chrome 70 the search always get blocked saying you have to turn on safe search (even though it's on via GPO). If I hit refresh or F5 at the block page the search will complete properly in (safe search mode).
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