Netflix error code F7355-1204 and F7363-1260

Solution 1:

You need to install codec (copy and paste in the terminal).

sudo apt install ubuntu-restricted-extras

Also, a browser extension may be causing the problem, try disabling them.

Solution 2:

Clear your Firefox (version 52 or higher only) caches by going to Preferences, Advanced, Network tab, and click the Clear Now buttons, shown below...

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