Activity 5 Using Google Chrome-Good Bad and maybe Ugly

For years the district has locked our computers from using anything by Explorer and it was great this year to find out that we can use Chrome. However, I'm a little leary of giving so much data to Google- it is weird and amazing and then creepy how a search for a vacation activity last year continues to produce popup ads for a activity that I queries 16 months ago.
I installed Angry birds

 Switcher, goo,gle shortern and btly shortern (which is used to always need a google search to find)

So what is the difference between and App and a Extension? I'll google it and tell you :

" Basically, an application is something that has its own UI and is displayed in the browser window. Separately, extensions notify and otherwise enhance the web experience. - here’s no "better" approach here; apps and extensions are simply different creatures. Let’s understand apps first. They are just how they sound: applications you can run inside your browser with a dedicated user interface and, typically, rich user interaction. We’ve already had the concept of “web apps” in the browser for a few years, as something more rich and interactive than a website, but less cumbersome and monolithic than a desktop application. Examples include games, photo editors, and video players; all of these categories are viable as tightly focused apps running inside the browser. Google Chrome is just formalizing the web app concept in a way that will be familiar to anyone who’s used apps on a smartphone."

How about extensions? Extensions also provide functionality, but unlike apps, there is little or no UI component. Instead, they extend the functionality of Google Chrome and the websites being viewed in it. For example, they can extend Google Chrome by adding a new button to the address bar, such as an ever-present currency converter. Buttons like this can also apply to the current website being viewed—for example, click the currency converter button to convert all prices on the website you’re viewing. want more details  (from https://developers.google.com/chrome/web-store/articles/apps_vs_extensions )