I am having trouble with Chrome, Edge, and Opera allowing access to xfinity.com. All three show a message that the browser does not meet the xfinity security standards and to upgrade to latest release. I have done that, but still have an issue. I see several messages on the forums with a similar issue, but without details about resolution. Tech support was not able to resolve (several resets of the modem were attempted) and I do have Firefox working well with xfinity (not sure why).
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