I can get new messages from chats in Telegram using my chrome extension, but I want to do some ocr if the messages contain images. Is there a way to get images from HTML elements? The general url given to them is 'blob:https://web.telegram.org/0aba78f4-db45-4e8f-8188-28850de9fc43', i tried encoding it to base64 to use with Tesseract.js but I can't seem to make it work