Examine source code of UnloadTabs

{
  "manifest_version": 2,
  "name": "UnloadTabs",
  "short_name": "UnloadTabs",
  "version": "0.8.5",
  "author": "Niklas Gollenstede",
  "description": "Unload your tabs to free resources and prevents them from loading unintentionally",
  "icons": {
    "1": "/icon.png"
  },
  "minimum_chrome_version": "55.0.0",
  "applications": {
    "gecko": {
      "id": "@unload-tabs",
      "strict_min_version": "59.0"
    }
  },
  "permissions": [
    "storage",
    "menus",
    "notifications",
    "tabs"
  ],
  "optional_permissions": [],
  "web_accessible_resources": [],
  "incognito": "spanning",
  "background": {
    "page": "node_modules/web-ext-utils/loader/_background.html"
  },
  "options_ui": {
    "page": "UnloadTabs#options",
    "open_in_tab": false
  },
  "commands": {
    "unloadSelectedTab": {
      "suggested_key": {},
      "description": "Unload the current tab"
    },
    "unloadSelectedTab_1": {
      "description": "Unload the current tab (alternative)"
    },
    "prevLoadedTab": {
      "suggested_key": {
        "default": "Alt+PageUp"
      },
      "description": "Switch to the previous loaded Tab"
    },
    "prevLoadedTab_1": {
      "description": "Switch to the previous loaded Tab (alternative)"
    },
    "nextLoadedTab": {
      "suggested_key": {
        "default": "Alt+PageDown"
      },
      "description": "Switch to the next loaded Tab"
    },
    "nextLoadedTab_1": {
      "description": "Switch to the next loaded Tab (alternative)"
    }
  }
}