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Blurry Picture When Viewing Spectrum TV on Firefox

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This began Feb 6, one day after my PC updated to Firefox 85.0.1. That may or may not mean anything.

I have been watching Spectrum TV for years using Firefox. Yesterday, the picture was blurry on all channels. I attempted to capture a still part of the picture. There is no stuttering - it looks a lot like somebody over zoomed a photo ( Zoom is 100%.). I have the same issue on multiple monitors, and everything else I display with Firefox, including YouTube videos, is normal.

When I watch Spectrum TV on MS Edge. the picture is normal.

Any idea what may be going on?

This began Feb 6, one day after my PC updated to Firefox 85.0.1. That may or may not mean anything. I have been watching Spectrum TV for years using Firefox. Yesterday, the picture was blurry on all channels. I attempted to capture a still part of the picture. There is no stuttering - it looks a lot like somebody over zoomed a photo ( Zoom is 100%.). I have the same issue on multiple monitors, and everything else I display with Firefox, including YouTube videos, is normal. When I watch Spectrum TV on MS Edge. the picture is normal. Any idea what may be going on?
Attached screenshots