Hi elbbs-8506,
Is there anything has been changed before the issue occurs?
Per my research you could try to uncheck "Enable JavaScript source maps" in developer tools settings.
Press F12 > Settings > Uncheck "Enable JavaScript source maps".
For Reference:
https://stackoverflow.com/questions/61339968/devtools-failed-to-load-sourcemap-could-not-load-content-for-chrome-extension
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