Examine source code of Link Preserver for Trello

{
  "manifest_version": 2,
  "name": "Link Preserver for Trello",
  "version": "1.0.0",
  "icons": {
    "16": "assets/icons/16.png",
    "32": "assets/icons/32.png",
    "48": "assets/icons/48.png",
    "128": "assets/icons/128.png"
  },
  "description": "Prevent Trello from transforming your links in card descriptions, checklist items, and comments.",
  "homepage_url": "https://tinypowerups.com",
  "short_name": "Link Preserver",
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "https://api-gateway.trello.com/*",
    "https://trello.com/*",
    "https://trello.com/b/*",
    "https://*.trello.com/*",
    "https://tinypowerups.com/*"
  ],
  "author": "tinypowerups.com",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icons/16.png",
      "32": "assets/icons/32.png",
      "48": "assets/icons/48.png",
      "128": "assets/icons/128.png"
    },
    "default_title": "Link Preserver for Trello",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://trello.com/b/*"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ]
    }
  ]
}