how can we access online contents which were enabled by adobe flash player

Adobe announced Flash Player's end-of-life in July 2017, three and a half years ago, giving content creators, programmers, developers and IT experts over 3 years to migrate their Flash content to a different technology. 

For reference:

• https://theblog.adobe.com/adobe-flash-update/
• https://www.adobe.com/products/flashplayer/end-of-life.html

Major browser vendors are deprecating Flash Player support.  For details specific to each vendor, please refer to:

• Google Chrome
• Microsoft Internet Edge and Internet Explorer
• Mozilla Firefox
• Apple Safari

For users attempting to view Flash content, contact the content creators and inquire about their plans to migrate their content to some other technology.

For enterprises dependent on Flash Player, please refer to the Enterprise end-of-life FAQ: 

• https://www.adobe.com/products/flashplayer/enterprise-end-of-life.html

Technical details can be found in the Flash Player Admin Guide, including Enterprise Enablement support: 

• https://www.adobe.com/devnet/flashplayer/articles/flash_player_admin_guide.html