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CORS errors blocking a Custom SharePoint Web Part from communicating to the RSS Feed source to display on the SharePoint page

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hanhd
hanhd
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CORS errors blocking a Custom SharePoint Web Part from communicating to the RSS Feed source to display on the SharePoint page ONLY on Firefox! Chrome and Edge displayed the web part contents but I got this CORS error with Firefox. My research has shown this is strict security settings from the RSS feed service provider but my company's non-technical staff insisted it was my web part that caused it.

Please inform me of any other way to make my web part display contents by ELIMINATING this Cors error on Firefox. Please see the attached image.

CORS errors blocking a Custom SharePoint Web Part from communicating to the RSS Feed source to display on the SharePoint page ONLY on Firefox! Chrome and Edge displayed the web part contents but I got this CORS error with Firefox. My research has shown this is strict security settings from the RSS feed service provider but my company's non-technical staff insisted it was my web part that caused it. Please inform me of any other way to make my web part display contents by ELIMINATING this Cors error on Firefox. Please see the attached image.
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