Sankaku Channel/

The blur filters used are supported by all modern browsers it would seem:

.blacklisted {filter:blur(5px);-webkit-filter:blur(5px);-moz-filter:blur(5px);-o-filter:blur(5px);-ms-filter:blur(5px);}

I suppose we could try to do this in JS as well.

Unfortunately only webkit-based browsers support CSS filters:
http://caniuse.com/#feat=css-filters

Also note that any JS-based methods require the images to be CORS-enabled, assuming the implementations use the HTML canvas element:
https://developer.mozilla.org/en-US/docs/HTML/CORS_Enabled_Image?redirectlocale=en-US&redirectslug=CORS_Enabled_Image