Google will stop some Flash content from automatically playing starting Sept. 1, a move it decided on earlier this year to improve browser performance.
Flash, made by Adobe Systems, is still widely used for multimedia content, but security and performance issues have prompted calls to move away from it.
In June, Google said it planned to pause Flash content that wasn’t central to a Web page but allow other content such as videos to autoplay. Flash, it said, can drain a user’s laptop battery faster.
There are also security implications that Google didn’t mention. Vulnerabilities in Flash are one of the most common ways that malware ends up on computers.