Note: The browser extension is for Google Chrome (at the time of this posting).
Article on http://ow.ly/E4G9N:
Medical Translator for Chrome Turns Medical Jargon Into Plain English
Chrome: If you’ve ever researched anything medical, you probably know what it’s like to have a bunch of jargon thrown at you, only to feel just as confused as when you started. Iodine’s Medical Translator translates confusing medical terminology into plain English when you hover over the word.