I'm using Windows 10, and have replicated the issue in the latest Firefox and Internet explorer. When browsing an article on the Reuters website they have a little video player pop up that runs an ad for Adobe before playing reuters content. This ad is unable to be muted, the video player has a mute button but despite having the video muted the ad still plays at full volume. The reuters content is muted after ad plays but to me this strikes of a purposeful and shameless bit of promotion on the part of Adobe. If providing an ad to the consumer for your product also has an entirely unfunctioning mute button it doesn't give me confidence in Adobe's products.