If you ever use public wifi on your machine, (and even if you don't), you are taking a huge risk by continuing to use the plug in workarounds. There is a good reason why they stopped working! The people who make the software need to address this issue. The solutions being offered here not only compromise the security of our computers and leave us vulnerable to malware & virus attacks, they are temporary fixes as well. From what I have read in this forum, "Adobe plans to kill flash completely in 2020".
Avoiding cyber attacks on macs depend on installing regular updates. From a security standpoint, folks are better off downloading & using software versions for camera views. If you do a workaround, make sure you are doing back ups!