Examine source code of Hetzblocker

{
  "manifest_version": 2,
  "name": "Hetzblocker",
  "homepage_url": "https://marklindhout.github.io/hetzblocker/",
  "version": "0.7.3",
  "description": "__MSG_extensionDescription__",
  "author": "Mark Lindhout",
  "default_locale": "en",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "webNavigation",
    "http://*/*",
    "https://*/*",
    "webRequest",
    "webRequestBlocking"
  ],
  "incognito": "spanning",
  "background": {
    "page": "data/html/background.html",
    "persistent": true
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "css": [
        "data/css/content.css"
      ],
      "js": [
        "data/js/content.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "hetzblocker",
    "default_icon": {
      "16": "data/icon/icon_default_16.png",
      "19": "data/icon/icon_default_19.png",
      "24": "data/icon/icon_default_24.png",
      "32": "data/icon/icon_default_32.png",
      "48": "data/icon/icon_default_48.png",
      "64": "data/icon/icon_default_64.png",
      "96": "data/icon/icon_default_96.png",
      "128": "data/icon/icon_default_128.png",
      "256": "data/icon/icon_default_256.png",
      "512": "data/icon/icon_default_512.png"
    }
  },
  "icons": {
    "16": "data/icon/icon_default_16.png",
    "19": "data/icon/icon_default_19.png",
    "24": "data/icon/icon_default_24.png",
    "32": "data/icon/icon_default_32.png",
    "48": "data/icon/icon_default_48.png",
    "64": "data/icon/icon_default_64.png",
    "96": "data/icon/icon_default_96.png",
    "128": "data/icon/icon_default_128.png",
    "256": "data/icon/icon_default_256.png",
    "512": "data/icon/icon_default_512.png"
  },
  "web_accessible_resources": [
    "data/css/*.css",
    "data/font/*",
    "data/html/block_*.html",
    "data/html/install-success_*.html",
    "data/icon/*",
    "_locales/*"
  ]
}