Examine source code of RocketLink

{
  "manifest_version": 2,
  "name": "RocketLink",
  "version": "1.0",
  "description": "Launch links in a new tab.",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "RocketLink"
  },
  "icons": {
    "48": "icons/rocket-icon-48.png",
    "96": "icons/rocket-icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21691324-6e9d-4a96-91d9-6f819323cd2a}"
    }
  }
}