What can we use as a substitute now that Flash is gone?
I moved your comment to a new discussion topic as the 6 year old topic you posted to is not relevant.
There is no substitute plugin for Flash Player. The solution is for content creators to migrate their content to a different technology.
Major browser vendors are deprecating Flash Player support. Details specific to each vendor:
For users attempting to view Flash content, contact the content creators and inquire about their plans to migrate their content to some other technology.