Examine source code of TabMark

{
  "manifest_version": 2,
  "name": "TabMark",
  "version": "1.0.2",
  "description": "Save groups of tabs and recall them.",
  "permissions": [
    "activeTab",
    "tabs",
    "bookmarks"
  ],
  "icons": {
    "16": "icons/tabmark.svg",
    "32": "icons/tabmark.svg",
    "48": "icons/tabmark.svg",
    "64": "icons/tabmark.svg",
    "96": "icons/tabmark.svg",
    "128": "icons/tabmark.svg"
  },
  "browser_action": {
    "default_icon": "icons/tabmark.svg",
    "default_title": "Tabs",
    "default_popup": "popup/tabs.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "113.0",
      "id": "{bb365bed-53b2-4c40-a0a8-af308d28b2f7}"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  }
}