Something like a browser extension could make that kind of check repeatable, automatic, and unobtrusive unless there's a discrepancy. Assuming builds don't happ

Something like a browser extension could make that kind of check repeatable, automatic, and unobtrusive unless there's a discrepancy. Assuming builds don't happen too too often. Yes, either you'd have to verify the build yourself or trust someone else to do it and independently publish something for the extension to compare to the client it's served.