Examine source code of CookiErazor

{
  "manifest_version": 2,
  "name": "CookiErazor",
  "version": "1.2resigned1",
  "description": "Enhance privacy by automatically deleting cookies when they're not needed anymore",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/user/miraculix200/",
  "icons": {
    "48": "icons/cr.fw.png"
  },
  "applications": {
    "gecko": {
      "id": "CookiErazor@example.org"
    }
  },
  "permissions": [
    "cookies",
    "contextualIdentities",
    "notifications",
    "storage",
    "webRequest",
    "<all_urls>",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/cr.fw.png",
      "32": "icons/cr.fw.png"
    },
    "default_title": "CookiErazor",
    "default_popup": "popup/browser_action.html"
  }
}