I'm sure any developer reading this is familiar with Chrome's feature to allow local Source overrides while the devtools window is open.
I'm not sure if Firefox's 'source map' feature can accomplish this same task with local files.
> Is it possible to overwrite the response headers?
Not yet, only response bodies.
You might monitor this bug to get updates:
https://bugzilla.mozilla.org/show_bug.cgi?id=1833158
never-displayed