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unable to play Amazon video even after enabling Widevine Content Decryption.

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I'm unable to play Amazon prime video with Firefox version 78.9.0esr. It just pops out a message saying "Firefox is installing some additional add-ons. Please try again later".

I'm unable to play Amazon prime video with Firefox version 78.9.0esr. It just pops out a message saying "Firefox is installing some additional add-ons. Please try again later".

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Try to toggle DRM off/on to see if that makes Firefox (re)load DRM components.

You can check the Browser Console for messages about requesting the Widevine plugin. You can use the filter and only enable XHR.

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Also make sure to update to Firefox 88.0.1.