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Screen Resolution keeps changing when viewing streaming programs (Netflix/Disney+/etc) in Firefox

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When ever I am on streaming sites such as Netflix or Disney+ or even various other news websites, my screen resolution seems to jump up a notch. Running a PC with WIn7 64bit and a Sony Bravia TV for a monitor. 1920x1080 is the resolution that I normally use. I have never encountered a screen resolution change outside of using Firefox.

When ever I am on streaming sites such as Netflix or Disney+ or even various other news websites, my screen resolution seems to jump up a notch. Running a PC with WIn7 64bit and a Sony Bravia TV for a monitor. 1920x1080 is the resolution that I normally use. I have never encountered a screen resolution change outside of using Firefox.

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Check that you do not run Firefox in compatibility mode or with reduced screen resolution. You can open the Properties of the Firefox desktop shortcut via the right-click context menu and check the "Compatibility" tab. Make sure that all items are deselected in the "Compatibility" tab of the Properties window.

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None of the items were selected when I opened the Properties. I noticed that the context menu was showing Windows Vista, I changed to WIndows 7, restarted FIrefox and tried again with a streaming site. Same issue.