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A comment on For your next side project, make a browser extension. Parent comment

Re:For your next side project, make a browser extension by old_hat on Sunday January 15, 2023 @06:11PM (#34394693)
Not OP, I built an extension for a site that sent CSP headers. Because the browser extension wasn't allowed in the list of JS sources, it all borked.

Not certain that's this user's issue, but that is another thing to check.

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Re:For your next side project, make a browser extension by jakear on Sunday January 15, 2023 @09:14PM (#34395996)
I suspect this is it. There were a lot of things logged to console for twitter violating its own CSP, but I didn’t see any for my script.

It seems the overall handling of network errors in add-ons has a lot of room for improvement.

It should be noted that chromium allows the network request regardless of the CSP. This is the correct, User-Empowering approach. Firefox’s deference to the Origin to control the code the User is attempting to run is the antithesis of what a User Agent ought to be.

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