Examine source code of Link Looker

{
  "manifest_version": 2,
  "name": "Link Looker",
  "author": "Glovebox Team",
  "description": "To clarify obfuscated URLs, to bypass unnessesary redirects and to remove tracking information embedded in link. Made by Glovebox",
  "homepage_url": "https://github.com/lars0281/glovebox_linkstraingthener",
  "version": "1.0.3",
  "icons": {
    "48": "icons/LL-48.png",
    "96": "icons/LL-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linklooker@glovebox.com",
      "strict_min_version": "63.0"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/LL-177.png",
    "theme_icons": [
      {
        "light": "icons/LL-32.png",
        "dark": "icons/LL-32.png",
        "size": 32
      }
    ],
    "default_title": "Link Looker: To clarify obfuscated URLs, to bypass unnessesary redirects and to remove tracking information embedded in links."
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/RevealUrl.js"
      ]
    }
  ],
  "permissions": [
    "webRequest",
    "activeTab",
    "tabs",
    "contextMenus",
    "menus",
    "storage",
    "unlimitedStorage",
    "<all_urls>"
  ]
}