Can't watch Amazon videos on Ubuntu 18.04.5

I noticed just this week that I can't watch Amazon Prime videos on any of the three browsers I have: Chromium, Brave, or Firefox. All three have widevine issues.

It occurred to me that I updated from 16 to 18 in the last two months and this seems to be the cause.

Is there any way to fix this?

I think you suffer this kind of problem --> How can I watch Amazon Prime videos using Firefox on Ubuntu 16.04?

All you need to do is simple. Install Firefox version 49 or newer. If this does not help, check this --> https://support.mozilla.org/en-US/kb/enable-drm

It's because of "Widevine" plug-in issue. Just find "Widevine" things and enable it. Hope this helps u