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"TypeError no detectado: no se pueden leer las propiedades de undefined (leyendo 'insertCSS')" Chrome Extension Manifest 3

Estoy haciendo una extensión de Chrome y quiero cambiar el css de la pestaña, pero me sale este error:

TypeError no capturado: no se pueden leer las propiedades de undefined (leyendo 'insertCSS')

Aquí está mi guión:

 applybtn.addEventListener('click', function () { chrome.scripting.insertCSS({ target: { tabId: activeTab.id }, files: ["/src/themes/test.css"] }); });
about 4 years ago · Juan Pablo Isaza
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