Firefox
Starting from August Firefox are starting to carry out their plans to reduce the use of flash in everyday browsing and will start to block certain Flash content which is not essential to the users experience. Then in 2017 Firefox will put in place a requirement where the user will have to click to activate flash plugin so that the content can be viewed.
In 2017, Firefox will require click-to-activate approval from users before a website activates the Flash plugin for any content. Websites that currently use Flash or Silverlight for video or games should plan on adopting HTML technologies as soon as possible. Firefox currently supports encrypted video playback using Adobe Primetime and Google Widevine as alternatives to plugin video
https://blog.mozilla.org/futurereleases/2016/07/20/reducing-adobe-flash-usage-in-firefox/
Chrome
For the next release of Chrome in September 2016 Google have announced that they will to stop support of flash by default on all websites.
