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signNow not functioning properly after Firefox update

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After installing a Firefox updated on Tuesday, I've been having multiple issues. The first issue I ran into was being unable to log into a work account that I have been using daily for 2 years. I was able to fix that issue by disabling the Enhanced Tracking Protection for that specific page. I tried that same fix for my other issue, but it is not correcting it.

I use a program called signNow to upload documents and send to people to sign/countersign. Since this update, it's not working on Firefox. I tried it on Edge and it works fine. When I upload a document, it's just blank. No text, pictures or anything at all. See attached screenshot. I've tried several documents and none have worked, but all of them have worked in Edge. How do I fix this so I can continue to use Firefox?

After installing a Firefox updated on Tuesday, I've been having multiple issues. The first issue I ran into was being unable to log into a work account that I have been using daily for 2 years. I was able to fix that issue by disabling the Enhanced Tracking Protection for that specific page. I tried that same fix for my other issue, but it is not correcting it. I use a program called signNow to upload documents and send to people to sign/countersign. Since this update, it's not working on Firefox. I tried it on Edge and it works fine. When I upload a document, it's just blank. No text, pictures or anything at all. See attached screenshot. I've tried several documents and none have worked, but all of them have worked in Edge. How do I fix this so I can continue to use Firefox?
Attached screenshots