SneakPeek

One of those "too good to be true" add-ons. I installed this because I wanted Arc's 5-second preview feature in my other browsers. - You can change the keyboard shortcut that triggers the preview to Shift, Alt, or Ctrl. - You can customize the border of the peek window. - You can set the behaviour of the peek window! - You can also have a temporary window that pops up like "Little Arc" (for Arc users) to navigate a web page or even watch a video! - And there are no ads or paywalls! And that'... Show more

Does not work

This extension has been really nice but a big flaw is that unless you have sneak peek set to not preload anything, you can't selectively blacklist a site from preloading other content that you don't want preloaded. If it had that, I think it would work perfectly, but until then, the lack of a blacklist really hurts it's potential

it mostly says preview unavailable