Examine source code of Bookmark.house

{
  "manifest_version": 2,
  "name": "Bookmark.house",
  "description": "With this extension you can save the current page to Bookmark.house.",
  "version": "1.2resigned1",
  "icons": {
    "16": "images/icon16.png",
    "57": "images/icon57.png",
    "192": "images/icon192.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "57": "images/icon57.png",
      "192": "images/icon192.png"
    },
    "default_popup": "popup.html",
    "default_title": "Click to save"
  },
  "permissions": [
    "activeTab",
    "https://bookmark.house/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3efe9b95-aaae-472c-a8fc-7e3d02764f5d}"
    }
  }
}