Failed to execute 'texImage2D' on 'WebGL2RenderingContext'. Access to image at 'imageurl.com' from origin 'exampale.com' has been blocked by CORS

i have seen this answer: Uncaught (in promise) DOMException: Failed to execute 'texImage2D' on 'WebGL2RenderingContext': Tainted canvases may not be loaded

it does help on local made server but i am trying to make an extension/addon so i run the script on different server and if i try to set the crossOrigin attribute to 'anonymous' it says:

Access to image at 'https://dl5zpyw5k3jeb.cloudfront.net/photos/pets/48663430/1/?bust=1596323497&width=560' from origin 'https://www.petfinder.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

my manifest:

{ 
    "manifest_version" : 2, 
    "name" : "tf", 
    "description": "tf",
    "version" : "0.2", 
    "content_scripts" : [
        { 
            "matches" : [ "<all_urls>"], 
            "js" : ["tfjs.js", "coco-ssd.js", "content.js"]
        }
    ]
}

my code:

const img = document.getElementByTagName('img');
img.setAttribute('crossOrigin', 'anonymous');
cocoSsd.load().then(model => {
    let canvas = document.createElement("CANVAS");
    let ctx = canvas.getContext("2d");
    canvas.width = img.width;
    canvas.height = img.height;
    ctx.drawImage(img, 0, 0);
    model.detect(img).then(predictions => {
          ctx.strokeRect(predictions[0].bbox[0], predictions[0].bbox[1], predictions[0].bbox[2], predictions[0].bbox[3]);
      }
      let dataURL = canvas.toDataURL();
      img.src = dataURL;
      });
    }
  });

Ty in advance