Examine source code of MultiLink Launcher

{
  "manifest_version": 2,
  "name": "MultiLink Launcher",
  "version": "2.0",
  "description": "Hold Shift and drag to select links with counter. Opens them in background tabs with configurable cap.",
  "permissions": [
    "tabs",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Link Area Opener - Hold Shift and drag to select links"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2fde6c32-8425-47cd-a60c-49ea7fe651da}"
    }
  }
}