Examine source code of Favourites

{
  "manifest_version": 2,
  "name": "Favourites",
  "version": "1.2.4",
  "permissions": [
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "activeTab"
  ],
  "description": "Simple alternative to Firefox's bookmarks.",
  "homepage_url": "https://flosommerfeld.github.io",
  "author": "flosommerfeld",
  "icons": {
    "96": "icons/icon_96.png"
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "ui/settings.html"
  },
  "browser_action": {
    "default_icon": "icons/icon_96.png",
    "default_title": "Favourites",
    "default_popup": "ui/popup.html"
  },
  "applications": {
    "gecko": {
      "id": "favourites@flosommerfeld.addons",
      "strict_min_version": "57.0"
    }
  }
}