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The USPS zip code locator webpage doesn't work. It works on Google Chrome.

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I haven't been able to get the USPS Zip Code webpage to work for several months (link below) using the Mozilla browser. When I switch browsers (Google Chrome), it works. https://tools.usps.com/go/ZipLookupAction!input.action?mode=1&refresh=true

I haven't been able to get the USPS Zip Code webpage to work for several months (link below) using the Mozilla browser. When I switch browsers (Google Chrome), it works. https://tools.usps.com/go/ZipLookupAction!input.action?mode=1&refresh=true

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Private Browsing mode can cause that and the Tracking Protection feature, too, can cause similar issues.

Try turning off Tracking Protection for that website. https://support.mozilla.org/en-US/kb/tracking-protection#w_turn-off-tracking-protection-for-individual-sites