Examine source code of Tabist

{
  "description": "Quick Tab Switcher",
  "manifest_version": 2,
  "name": "Tabist",
  "version": "0.1.7resigned1",
  "homepage_url": "https://github.com/fiveNinePlusR/tabist",
  "icons": {
    "48": "icons/page-48_white.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/page-32_white.png"
  },
  "commands": {
    "toggle-tabist": {
      "suggested_key": {
        "default": "Ctrl+Shift+E",
        "mac": "Ctrl+Shift+E",
        "windows": "Ctrl+Shift+E"
      },
      "description": "Toggle or activate a Tabist tab"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{607e6aa4-8374-4df2-8922-931d1ac961f6}"
    }
  }
}