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A few websites don't work on Firefox, but work on Firefox Focus, Edge, Safari, etc.

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Hi everyone.

A few websites for the past month don't work for me on Firefox (WIn10), but work on Firefox Focus (iOS), Edge (Win10), Safari (iOS), etc.

I think maybe it's a configuration issue or a corrupted file or something. I don't have strict tracking protection on, and tried the troubleshooting mode. Or are some sites blocking Firefox Desktop in particular?

I also tried using a VPN to make sure it isn't geo-blocking. Example: https://wikidiff.com/assorted/assortment

Attached screenshot. Many thanks.

Hi everyone. A few websites for the past month don't work for me on Firefox (WIn10), but work on Firefox Focus (iOS), Edge (Win10), Safari (iOS), etc. I think maybe it's a configuration issue or a corrupted file or something. I don't have strict tracking protection on, and tried the troubleshooting mode. Or are some sites blocking Firefox Desktop in particular? I also tried using a VPN to make sure it isn't geo-blocking. Example: https://wikidiff.com/assorted/assortment Attached screenshot. Many thanks.
Attached screenshots

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