I built something like this but much worse. No extension, no recording, I literally sit there with Chrome devtools open, do the action manually, copy the 3-4 network requests into a Python script, and replay them with urllib and a cookie jar.

It's absurd but it works. Gumroad's cover image upload for example, their actual API can't do it, but the browser makes 3 requests (presign to their Rails Active Storage endpoint, PUT the binary to S3, POST the signed_blob_id to attach it). Captured those once in April, been replaying them since. I uploaded covers and thumbnails to 9 products today without opening a browser.

Obviously falls apart the second they change anything.