The latest update to Chrome Canary includes flags for enabling "tab hover cards", which let you preview the content of a tab before opening it. It's not currently known when the feature will roll out.
Tab preview RSS
Microsoft's Edge browser is a world of difference from the previous iteration of Internet Explorer. Despite improvements, the browser is still losing users to the competition.
Tab preview - which lets you glance at another browser tab by hovering the cursor over it - was first seen in an Edge video in April, but Microsoft says it's "coming to Insider builds really soon".