Examine source code of Social Pins

{
  "manifest_version": 2,
  "name": "Social Pins",
  "version": "1.0.1resigned1",
  "description": "Pin all your social links in the browser, use shortcuts to access them anytime just Alt+Shift+(F/W/T/G) facebook/whatsapp/twitter/gmail",
  "icons": {
    "64": "icons/logo_64.png",
    "96": "icons/logo_96.png",
    "128": "icons/logo_128.png"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "open-whatsapp": {
      "suggested_key": {
        "default": "Alt+Shift+W"
      },
      "description": "Open whatsapp"
    },
    "open-facebook": {
      "suggested_key": {
        "default": "Alt+Shift+F"
      },
      "description": "Open facebook"
    },
    "open-twitter": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Open twitter"
    },
    "open-gmail": {
      "suggested_key": {
        "default": "Alt+Shift+G"
      },
      "description": "Open Gmail"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d71a72b5-701f-4012-b199-7133e028104d}"
    }
  }
}