So, Adobe Flash Player is going away on January 1st.
So, after that date, how will we access sites that use it?
You will not be able to use sites that have ignored this problem. They had 3 years to fix it, but some chose to let their sites die instread.
The onus is on the content provider to migrate their content to different technology, or do nothing. Some have migrated, some are in the process of migrating, some will not migrate. For those that have chosen not to migrate, their content will stop working when Flash Player is end-of-lifed and all browsers drop support for the plugin.
Original Flash Player EOL announcement from 2017: https://theblog.adobe.com/adobe-flash-update/
Flash Player EOL FAQ for Consumers: https://www.adobe.com/products/flashplayer/end-of-life.html