Error I get "Access Denied" error when searching O'reilly Auto part with Firefox browser only

Here's the error page I get from O'reilley Auto Parts when searching. (I don't get this error when on O'relley com, but ONLY when searching for a part and ONLY with Firefox on my desktop. This started just a few months ago. All ad blocks and U Block Origin are disabled): https://www.oreillyauto.com/search/v/a/4649/automotive-car-1988-pontiac-fiero?q=oil+filter Access Denied You don't have permission to access "http://www.oreillyauto.com/search/v/a/4649/automotive-car-1988-pontiac-fiero?" on this server. Reference #18.8aa03b17.1772750536.8978d2fa https://errors.edgesuite.net/18.8aa03b17.1772750536.8978d2fa