Sorry, I have no idea what "Shockwave Pepper Flash Plugin" is; can you elaborate?
At the same time, tell us your operating system and browser.
1. Open Chrome and type "chrome://plugins" in your address bar.
2. Click on the + sign that is at the top right corner of the page to expand the details.
3. Locate "Flash" section and click on "Disable" for the one that has Type as PPAPI and the Location ends with pepflashplayer.dll.