Looks like those are placeholders. Can you check if you see a Canvas Icon in the url bar? If so click on it to enable reading of canvases.
Bug 1914307 Comment 5 Edit History
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Looks like those are placeholders. Can you check if you see a Canvas Icon in the url bar? If so click on it to enable reading of canvases. (This assumes you are not on a mobile device, we currently don't have UI for enabling canvas reading on mobile)