Examine source code of Pin Unpin Tab

{
  "manifest_version": 2,
  "name": "Pin Unpin Tab",
  "version": "5.0",
  "description": "Pin or unpin a tab through the toolbar icon, or a keyboard shortcut, or a left long-click anywhere on the page.",
  "homepage_url": "https://github.com/jayesh-bhoot/pin-unpin-tab",
  "browser_action": {
    "default_icon": {
      "48": "./src/icons/pin-dark.svg",
      "96": "./src/icons/pin-dark.svg"
    },
    "theme_icons": [
      {
        "light": "./src/icons/pin-light.svg",
        "dark": "./src/icons/pin-dark.svg",
        "size": 48
      },
      {
        "light": "./src/icons/pin-light.svg",
        "dark": "./src/icons/pin-dark.svg",
        "size": 96
      }
    ]
  },
  "background": {
    "scripts": [
      "./src/bg.build.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./src/long_click.build.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "./src/preferences.html",
    "browser_style": true
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "./src/icons/pin-dark.svg",
    "96": "./src/icons/pin-dark.svg"
  },
  "commands": {
    "_execute_browser_action": {
      "description": "Default shortcut to toggle pinned status of the active tab",
      "suggested_key": {
        "default": "Alt+P",
        "mac": "MacCtrl+Shift+P"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-j1RdUbjJ4pH8Yw@jetpack"
    }
  }
}