An extension that will blur all previews on Youtube so your expreince here become less distractive and more delibirate.
At present, the extension can be used on both Firefox and chrome.
To set up, unload the extenstion into the browser. Steps on how to do this for each browser can be found online.
That's it! All you have to do now is press the plugin button on the browser toolbar and enable and disable as you wish.