The quick story is that Google Chrome Helper isn’t really the problem. It tends to go on the rampage when there’s a rogue extension or when Google Chrome’s plug-in settings are configured to run everything by default. There’s a long list of the plug-ins supported by Chrome here, but most users in the Help Center forums seem to run into trouble when it’s working with Flash content.
Disabling Helper’s auto-helping is easy, and it won’t prevent you from using plug-ins. You’ll just have to opt in to view plug-in content on a case-by-case basis. Deactivating it isn’t entirely intuitive, though—there’s no mention of the Helper outside of your Activity Monitor and forum complaints. You’ll have to dig a couple of levels deep into your Chrome settings. First, shut down all your Chrome windows without quitting the program. In the Chrome menu, go to “Preferences,” scroll all the way down in the menu, and click on “Show advanced settings…” The first item in the expanded advanced settings list will be “Privacy,” and click on the “Content Settings” button right under that. About halfway down the content settings list is a “Plug-ins” entry, which will likely be set to “Run automatically.” Instead, select “Click to play.” This is essentially the same thing as configuring email to load images only when you click a “load images” link. Any embedded Flash, Java, Quicktime, DivX, or Silverlight content on a webpage will appear as a grayed-out space until you click on it to load the player and the content.
source: http://www.wired.com/2014/10/google-chrome-helper/
