How can I add the 'Access-Control-Allow-Origin' header to Webflow to resolve the issue in Firefox and Safari where images are not being displayed? Is the syntax of the header supposed to be in HTML or Javascript?

To add the 'Access-Control-Allow-Origin' header in Webflow, you will need to utilize custom code. This header is usually set on the server-side, but since Webflow is a serverless platform, we need to add it through JavaScript.

To add the header, follow these steps:

1. Go to the page where you want to add the header in the Webflow Designer.
2. Add an HTML Embed element to the page by dragging it from the Add panel.
3. Double-click the HTML Embed element to open the code editor.
4. Add the following JavaScript code inside the `

```

Make sure to replace `<your_image_url>` with the actual URL of the image you want to display.

5. Save and publish your changes.

The above code uses JavaScript's `fetch` API to fetch the image with the specified URL and includes the `Access-Control-Allow-Origin` header to allow cross-origin requests from any origin. The image is then created as an `Image` object and appended to the `document.body`.

By dynamically creating the image using JavaScript, you can ensure that the 'Access-Control-Allow-Origin' header is included, thus resolving the issue of Firefox and Safari not displaying the images.

Remember to include the appropriate URL of the image you want to display in the `imageUrl` variable.