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Zen browser cannot play viki.com videos while Firefox browser can

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After extensive testing, it appears viki.com and Amazon.com videos don't play on the Zen browser (based on Firefox), but the pure Firefox browser can play them.

All of the DRM and related recommendations, including clearing cache, have been done. Results remain the same.

Has anyone resolved this issue?

After extensive testing, it appears viki.com and Amazon.com videos don't play on the Zen browser (based on Firefox), but the pure Firefox browser can play them. All of the DRM and related recommendations, including clearing cache, have been done. Results remain the same. Has anyone resolved this issue?

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