Examine source code of Hash Linker

{
  "manifest_version": 2,
  "name": "Hash Linker",
  "version": "1.0",
  "description": "Converts MD5, SHA1, SHA256, and SHA512 hashes to hyperlinks",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Hash Linker Settings"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{14e4237d-53a6-41eb-a1b2-1a9ee28d4422}"
    }
  }
}