title: What does "http://*/*", "https://*/*" and "<all_urls>" mean in the context of Chrome extension's permissions
body: <p>I am trying to understand the working of Google chrome extensions. I was studying the <code>manifest.json</code> file where I came across the permissions <code>"http://*/*"</code>, <code>"https://*/*"</code> and <code>"&lt;all_urls&gt;"</code></p>
  
  <p>Can anybody explain what do these permissions mean?</p>