Examine source code of Seedkeys

{
  "manifest_version": 2,
  "name": "Seedkeys",
  "version": "5.3resigned1",
  "author": "Willem van Nus",
  "description": "A password manager that generates your passwords based on a seed.",
  "icons": {
    "48": "icons/logo.svg"
  },
  "applications": {
    "gecko": {
      "id": "willem@dangojapanese.jp",
      "strict_min_version": "45.0"
    }
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "javascript/content.js"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "javascript/sha256.js",
      "javascript/generatepassword.js",
      "javascript/background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/logo.svg",
      "32": "icons/logo.svg"
    },
    "default_title": "Seedkeys",
    "default_popup": "html/popup.html",
    "theme_icons": [
      {
        "light": "icons/logo.svg",
        "dark": "icons/logo.svg",
        "size": 16
      },
      {
        "light": "icons/logo.svg",
        "dark": "icons/logo.svg",
        "size": 32
      }
    ]
  }
}