I'm on a PC at work at the moment, and I'm not sure things look the same on Chrome for Mac, but: 1. Settings2. "Content Settings" under "Privacy"3. "Disable individual plug-ins" under "Plug-ins"4. Disable Flash While you're there, if you happen to have the Adobe PDF viewer selected instead of Chrome's, switch to the Chrome one. It's faster and also less feature-rich, so probably more secure against attacks that target Adobe's crappy security measures.