Examine source code of xkcd Explanifier

{
  "manifest_version": 2,
  "name": "xkcd Explanifier",
  "version": "1.1",
  "author": "TheUltimateGuide, a Youtube channel",
  "description": "A Chromium Extension to open a new tab with the explanified version of a xkcd comic",
  "icons": {
    "48": "icons/nasapod48x48.png",
    "96": "icons/nasapod96x96.png"
  },
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "<all_urls>",
    "tabs"
  ]
}