Examine source code of Multi-Search Launcher

{
  "manifest_version": 2,
  "name": "Multi-Search Launcher",
  "description": "Launch searches for the selected text in multiple search engines with one click",
  "version": "1.0",
  "icons": {
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/icon-64.png",
    "default_title": "Multi-Search Launcher",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{141994e5-eef4-47db-9b1b-531df42554e0}",
      "strict_min_version": "99.0"
    }
  }
}