Examine source code of Plinky

{
  "manifest_version": 2,
  "name": "Plinky",
  "description": "Save links to Plinky from any browser tab.",
  "version": "2.0",
  "icons": {
    "16": "icons/icon_16x16.png",
    "19": "icons/icon_19x19.png",
    "32": "icons/icon_32x32.png",
    "38": "icons/icon_38x38.png",
    "48": "icons/icon_48x48.png",
    "72": "icons/icon_72x72.png",
    "96": "icons/icon_96x96.png",
    "128": "icons/icon_128x128.png",
    "256": "icons/icon_256x256.png",
    "512": "icons/icon_512x512.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "identity",
    "tabs",
    "activeTab",
    "https://api.plinky.app/*",
    "https://appleid.apple.com/*",
    "https://plinky.app/*"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "commands": {
    "save-to-plinky-action": {
      "suggested_key": {
        "default": "Ctrl+Shift+P",
        "windows": "Ctrl+Shift+P",
        "mac": "Command+Shift+P",
        "chromeos": "Ctrl+Shift+P",
        "linux": "Ctrl+Shift+P"
      },
      "description": "Save the current page to Plinky"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "plinky@redpanda.club"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Save to Plinky",
    "default_icon": {
      "16": "icons/icon_16x16.png",
      "19": "icons/icon_19x19.png",
      "32": "icons/icon_32x32.png",
      "38": "icons/icon_38x38.png",
      "48": "icons/icon_48x48.png",
      "72": "icons/icon_72x72.png"
    }
  }
}