Back in June of this year, Google announced that they will enhance security and speed of their desktop browser Chrome by blocking Flash content from loading by the end of the year. Starting with Chrome 53, the Chrome team stopped Flash background-content from loading. Now with Chrome 55, they continue on that path by defaulting to HTML5 content with two exceptions: The top 10 sites on the internet containing Flash content will be exempted for a year. Those are sites like Facebook, Youtube, Yahoo, Twitch, Amazon, Live.com and a few popular Russian sites. Also sites, that only offer Flash content are exempted as well.
According to Google this will lead to faster load times and more security for users. On the Android side of things, Chrome 55 will introduce a new offline feature, allowing Android users to download websites, videos and images and later read and watch them offline. While the Windows, Linux and macOS version of Chrome 55 is already available, the Android version is expected to be released shortly.