I'm not sure if I'm adding meebocdn.com to my blacklist correctly. But I was able to block Slate's toolbar through the AdBlock interface...

I believe using the ghostery extension automatically blocks it as well.

edit for links:

link for Chrome: https://chrome.google.com/webstore/detail/mlomiejdfkolichcfl...?

link for Firefox: https://addons.mozilla.org/en-US/firefox/addon/ghostery/

You forgot the link for Opera: https://addons.opera.com/en-gb/extensions/details/ghostery/