Examine source code of Slack Redirect

{
  "manifest_version": 2,
  "name": "Slack Redirect",
  "version": "1",
  "description": "Redirects Slack archive links to open directly in the browser instead of trying to open the Slack app",
  "browser_specific_settings": {
    "gecko": {
      "id": "SlackRedirect@joivid.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "*://*.slack.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "SlackRedirect_48x48.png",
    "96": "SlackRedirect_96x96.png"
  }
}