Examine source code of BnF Redirect

{
  "manifest_version": 2,
  "name": "BnF Redirect",
  "version": "1.3",
  "homepage_url": "https://github.com/iandeveseleer/bnf-redirect",
  "description": "Automatically redirects links to mediapart.fr to the version accessible to BnF subscribers.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{13ae856c-1e66-42ce-8a19-b1ad08442e04}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "bnf.js"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "storage"
  ]
}