Examine source code of Ciphercat

{
  "manifest_version": 2,
  "name": "Ciphercat",
  "description": "Adds quick and easy encryption and decryption to your browser.",
  "homepage_url": "https://github.com/burrizza/Ciphercat",
  "version": "0.1.1",
  "permissions": [
    "storage",
    "downloads",
    "activeTab",
    "contextMenus",
    "notifications",
    "clipboardWrite",
    "clipboardRead"
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_title": "Ciphercat says meow!",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "48": "icons/icon_48.png",
      "128": "icons/icon_128.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6890e719-87f4-40ce-a229-50041ab0dd15}"
    }
  }
}