Examine source code of SlackRedirectRemover

{
  "manifest_version": 2,
  "author": "Altahrïm",
  "name": "SlackRedirectRemover",
  "version": "1.2.2",
  "description": "Extension allowing to bypass redirection to slack-redir.net",
  "homepage_url": "https://gitlab.com/altahrim/SlackRedirRemover",
  "icons": {
    "128": "icons/logo_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.slack.com/*"
      ],
      "js": [
        "remover.js"
      ]
    }
  ]
}