Basemaps not appearing on Firefox
The tiles and markers load in Firefox, but the basemaps do not. The request to the basemap tiles is being blocked. It appears to be a certificate issue, for some reason firefox does not seem to think it's a valid certificate? However, the certificate appears to be valid, so I'm not sure what the issue is at this point. This issue is confined to Mozilla FireFox browser.
Open in Firefox
https://services.arcgisonline.com/arcgis/rest/services//Canvas/World_Light_Gray_Base/MapServer/tile/4/6/2
Your connection is being intercepted by a TLS proxy. Uninstall it if possible or configure your device to trust its root certificate.
HTTP Strict Transport Security: false
HTTP Public Key Pinning: false
Certificate chain:
-----BEGIN CERTIFICATE-----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yR4166sCAwEAAaNSMFAwLwYDVR0RBCgwJoISKi5hcmNnaXNvbmxpbmUuY29tghBh
cmNnaXNvbmxpbmUuY29tMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAN
BgkqhkiG9w0BAQsFAAOCAQEAy4M7Pe+FawjOicbJvP6xGvXETi4+yv9d2TlEQGs2
d4tc5K5ft1WMwHohn46evNBhqcyE/a9x4xQvnZZw7Rnc/u7dPoxawFAmeYqbBdi+
abCpNGRelWp4OkEJ5XC38ct8xvlFa4wYrTE5sn3gX/o9iBFark/fD0qfSTgqP8Bv
vrendK8ZV0LdvX8kay/6gJCYXp2OPRFN96sMOntXzQphkfdcD81CZTWkD/At4t6h
qYLMbZ9NSdoAenwFOCx4Sjb9If/PCD8uKTj5Uqp6V18iOEKfwJfSqhpK39h5W97V
dgI6jHxFefzdhN6TogBJpp3i3Hx52AYFKhQLfqWTWGVU1Q==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGEzCCA/ugAwIBAgITTAAAACl3vQKmlOvLJgAAAAAAKTANBgkqhkiG9w0BAQsF
ADAVMRMwEQYDVQQDEwpET0lSb290Q0EyMB4XDTE5MDUyMTE3MjYxMVoXDTI0MDUy
MTE3MzYxMVowgZ4xCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJDbzEPMA0GA1UEBxMG
RGVudmVyMSMwIQYDVQQKExpEZXBhcnRtZW50IG9mIHRoZSBJbnRlcmlvcjEMMAoG
A1UECxMDRVNOMRswGQYDVQQDFBJBMTBfREVOMV9TU0xpX0NlcnQxITAfBgkqhkiG
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TgP7IjAfBgNVHSMEGDAWgBS/hivK82xtPl8cO05O2I3nasdqTzCB+AYDVR0fBIHw
MIHtMIHqoIHnoIHkhoGybGRhcDovLy9DTj1ET0lSb290Q0EyLENOPUlJTkRFTk9S
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MFYGCCsGAQUFBwEBBEowSDBGBggrBgEFBQcwAoY6aHR0cDovL3BraTIuZG9pLm5l
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AYI3FAIEDB4KAFMAdQBiAEMAQTANBgkqhkiG9w0BAQsFAAOCAgEADsaDgfkul/Zw
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EP5vCOVk7Runv0LDRLXq0alTlpepHCvkZgQSc6np+9eVHt7Mg1+VFt1hwU6eoTn2
vcK4p7kI3m87dN1YfzHx5GEGq69kRVJVnTr48O5obAu4dRMihYs0aD41c/Wahybe
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upB6N163ZtH05ySec7oMsjRCJ4zPxxHrWOUHkdT3Tt4X9tkvLIOe7IOCB5Kr22Jq
PZDLUhy/ukQ4ZY2stXCJbcmgoCkqpMTc/9fwGQA9APZBsV2OjexlaEXy+Tj2PEtt
qM4Ni23P/TzmacgUs6WPq/3gJpLqgIk=
-----END CERTIFICATE-----