Examine source code of bl.ocks Redirector

{
  "manifest_version": 2,
  "name": "bl.ocks Redirector",
  "version": "1.1.0",
  "description": "Redirects links to the now-dead bl.ocks.org to the clone at blocks.roadtolarissa.com.",
  "icons": {
    "48": "icons/blocks-redirect-48.png",
    "96": "icons/blocks-redirect-96.png"
  },
  "applications": {
    "gecko": {
      "id": "blocks-redirect@pjpscriv"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://bl.ocks.org/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "blocks_redirect.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://bl.ocks.org/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "102.0",
      "id": "blocks-redirect@pjpscriv"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  }
}