Examine source code of Fabs.link

{
  "manifest_version": 2,
  "name": "Fabs.link",
  "version": "0.4resigned1",
  "description": "Online Bookmark manager",
  "homepage_url": "https://fabs.link",
  "icons": {
    "48": "icons/fabs_main_icon.svg",
    "96": "icons/fabs_main_icon.svg"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "alarms",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/fabs_toolbar_icon.svg",
    "default_title": "Fabs"
  },
  "sidebar_action": {
    "default_title": "Fabs",
    "default_panel": "html/sidebar.html",
    "default_icon": "icons/fabs_toolbar_icon.svg",
    "browser_style": false
  },
  "page_action": {
    "default_icon": "icons/page_action_inactive.svg",
    "default_title": "Add link to Fabs",
    "default_popup": "html/add_bookmark.html"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "options_ui": {
    "page": "html/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07111780-9d0e-482c-9ae2-a01dd858b705}"
    }
  }
}