Examine source code of requestblock

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "requestblock",
  "version": "2.2resigned1",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://sasattarrow.com/",
  "icons": {
    "48": "48.png"
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "*://*/*",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "requestblock@sasattarrow.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "requestblock",
    "default_icon": {
      "48": "48.png"
    },
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}