Google-chrome – Chrome and Hangouts both use CTRL+D for something different

Can someone tell me why? Because you used different web browsers.

Google, is an advertising company, a pretty big and successful one. So, it's not surprising that one component in deciding what search results are most relevant to you is what browser you're using.

From that information, they can infer generalizations about you and thus attempt to show you particularly relevant things.

I could be wrong, but I'm pretty sure I'm not.

The new Hangouts feature needs to be enabled by logging into the Admin console and going to

Google Apps -> Talk/Hangouts -> Advanced Settings

and select 'Enable the new Hangouts for users in this organizational unit'