Examine source code of Hyperlink List

{
  "description": "List all hyperlinks",
  "manifest_version": 2,
  "name": "Hyperlink List",
  "version": "0.0.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "HyperlinkList@ettoolong",
      "strict_min_version": "66.0"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Hyperlink List",
    "default_popup": "popup.html"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "file:///*",
    "tabs"
  ]
}