Examine source code of Arima Notes

{
  "manifest_version": 2,
  "name": "arima.one Notes",
  "version": "1.0",
  "description": "A plugin to write and save notes for a website URL.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "alarms",
    "https://arima.one/*",
    "https://accounts.arima.one/*",
    "https://notes.arima.one/*",
    "http://arima.one:8080/*",
    "http://accounts.arima.one:8080/*",
    "http://notes.arima.one:8080/*"
  ],
  "browser_action": {
    "default_icon": "assets/icon.svg",
    "default_title": "arima.one Notes"
  },
  "commands": {
    "open-popup": {
      "suggested_key": {
        "default": "Alt+Shift+N",
        "mac": "Alt+Shift+N"
      },
      "description": "Toggle the arima.one Notes panel"
    }
  },
  "icons": {
    "16": "assets/icon.svg",
    "48": "assets/icon.svg",
    "128": "assets/icon.svg"
  },
  "web_accessible_resources": [
    "assets/icon.svg",
    "assets/logo.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{16158f75-bb8f-4b80-9bcc-1b75e32af81a}"
    }
  },
  "background": {
    "scripts": [
      "assets/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "assets/contentScript.js"
      ],
      "run_at": "document_end"
    }
  ]
}