Here is just an FYI for anyone interested in the official announcement of Flash's demise that will occur on December 31, 2020...
https://www.cnet.com/news/adobe-kills-flash-web-browser-tech-2020/
From the article: "In three and a half years, Adobe will stop developing and distributing Flash, said Govind Balakrishnan, vice president of product development for Adobe's Creative Cloud Ecosystem."
How different browsers will handle Flash:
Chrome: Google's browser began asking us for permission to run Flash on some websites last year, and it'll do so more often and later disable Flash by default. "We will remove Flash completely from Chrome toward the end of 2020," Google said.
Firefox: Mozilla's browser will start asking you in August which sites you want to enable Flash on, it'll disable Flash altogether by default in 2019, and there will be lingering support through the end of 2020 only in Firefox's less frequently updated Extended Support Release.
Edge: The newest version of Microsoft's browser uses a click-to-run option that asks if you want to run Flash on a website, a policy that will continue through mid-2018. The company's older Internet Explorer browser won't give you any grief. In mid-2018, Edge will be more aggressive about requiring you to authorize Flash. In 2019, Microsoft will disable Flash by default, and by the end of 2020, Microsoft will disable it completely in both browsers.
Safari: Last year, Apple's Safari started blocking Flash from running. If you really want it, you can re-enable it on websites that offer to download Flash, an action Safari notices and that will give you an offer to run Flash for the site.