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Hi, are you having this problem on Bing?
If it's Bing:
Try the workaround in the following thread:
https://support.mozilla.org/questions/1364887
Let me know if that fixes it for you.
If it's not Bing:
What site are you having trouble with? Could you describe the behavior in more detail, for example, how long is your setting kept/when is it lost?