Examine source code of Tippin.me

{
  "applications": {
    "gecko": {
      "id": "extensionFirefox@tippin"
    }
  },
  "name": "Tippin Extension (tippin.me)",
  "short_name": "Tippin",
  "version": "1.0.7.1",
  "description": "Send and receive Bitcoin tips to Twitter users!",
  "manifest_version": 2,
  "icons": {
    "16": "icon-on/16.png",
    "48": "icon-on/48.png",
    "128": "icon-on/128.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icon-off/16.png",
      "48": "icon-off/48.png",
      "128": "icon-off/128.png"
    }
  },
  "homepage_url": "https://tippin.me",
  "content_security_policy": "script-src 'self' 'sha256-GgRxrVOKNdB4LrRsVPDSbzvfdV4UqglmviH9GoBJ5jk='; object-src 'self'",
  "content_scripts": [
    {
      "matches": [
        "https://tippin.me/*"
      ],
      "js": [
        "jquery.js",
        "official/content-official.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://twitter.com/*",
        "https://mobile.twitter.com/*",
        "https://tweetdeck.twitter.com/*"
      ],
      "js": [
        "jquery.js",
        "tippin/content-tippin.js"
      ],
      "run_at": "document_end"
    },
    {
      "all_frames": true,
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_end",
      "js": [
        "payAnyWhere/content-payAnyWhere.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "clipboardWrite",
    "clipboardRead",
    "tabs",
    "storage",
    "scripting",
    "declarativeContent"
  ],
  "web_accessible_resources": [
    "images/*.svg",
    "injectedScript/injectedScript.js",
    "payAnyWhereInjectedScript/payAnyWhereInjectedScript.js"
  ]
}