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Javascript 'fetch()' no longer works on Firefox

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I have a website that uses Javascript 'fetch()' to call pages on the server, and no matter what I try, it never works, since around the end of the year. I keep getting the following error:

"Uncaught (in promise) TypeError: NetworkError when attempting to fetch resource."

Can somebody help?

Thanks in advance

DC

I have a website that uses Javascript 'fetch()' to call pages on the server, and no matter what I try, it never works, since around the end of the year. I keep getting the following error: "Uncaught (in promise) TypeError: NetworkError when attempting to fetch resource." Can somebody help? Thanks in advance DC

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Try to ask advice on a web development oriented forum.