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Mozilla will block Flash in Firefox starting next month
Reducing Adobe Flash Usage in Firefox
Starting in August, Firefox will block certain Flash content that is not essential to the user experience, while continuing to support legacy Flash content.
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Firefox will continue this trend by blocking specific Flash content invisible to users.
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In 2017, Firefox will require click-to-activate approval from users before a website activates the Flash plugin for any content.
There's been no reason for anyone developing new Flash content for some time. Some sites that have Flash content, as it indicates, will still be "legacy content" although, i'm not sure exactly how it would identify that.