Examine source code of Save and Restore Tabs

{
  "manifest_version": 2,
  "name": "Save and Restore Tabs",
  "version": "1.0",
  "homepage_url": "https://github.com/tomasflek/firefox-save-and-restore-tabs",
  "description": "A Firefox extension to save and restore tabs",
  "icons": {
    "48": "icons/tabs48.png",
    "96": "icons/tabs96.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "downloads"
  ],
  "browser_action": {
    "default_title": "Save and Restore Tabs",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "0b292a5d1904dd0136cf884c4d76b5b5eb5ef58c@tabs-addon",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "restoretabs.js",
        "popup.js"
      ]
    }
  ]
}