Since Adobe itself has discontinued this product, there are no official fixes to the issue. However, there are some solutions you can implement to unblock Flash Player on Chrome, Edge, Firefox ...

So, if you are running a Windows 10 computer, you can have up to 4 copies of Adobe Flash Player: one for Internet Explorer, one for Microsoft Edge, one for Firefox, and one for Opera, respectively.

The Adobe Flash player and Javascript are required in order to view a video which appears on this page. You may wish to download the Adobe Flash player. One figure ...