What kinda trouble shooting did you do? Did you look at netflix help site as well?

See:

• https://help.netflix.com/en/node/32661

Suddenly getting netflix error f7701 - 1003. Have tried Troubleshoot mode to no avail. Ideas?

tried everything so far that fixed the problem before:

DRM on/off clear cookies/cache close / restart pc. check up to date firefox etc..

has been working fine till tonight (15/7/22) was ok this morning

Can't get it to work on firefox but on mobile and xbox it's fine.

so has NETFLIX suddenly done something to upset firefox.. to just cause issues on this browser...