Examine source code of Load Background Tabs Lazily

{
  "manifest_version": 2,
  "name": "Load Background Tabs Lazily",
  "description": "Allow only a specific number of new background tabs to load at one time.",
  "version": "1.71",
  "author": "kgersen",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "tabs",
    "storage",
    "browserSettings",
    "menus",
    "sessions",
    "tabGroups"
  ],
  "optional_permissions": [
    "<all_urls>",
    "bookmarks",
    "downloads"
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "pauseResume": {
      "suggested_key": {},
      "description": "Pause or resume loading tabs in the line"
    },
    "addServerNotFound": {
      "suggested_key": {},
      "description": "Add tabs that failed to load to the line"
    },
    "custom1": {
      "suggested_key": {},
      "description": "Custom command 1"
    },
    "custom2": {
      "suggested_key": {},
      "description": "Custom command 2"
    },
    "custom3": {
      "suggested_key": {},
      "description": "Custom command 3"
    },
    "custom4": {
      "suggested_key": {},
      "description": "Custom command 4"
    }
  },
  "icons": {
    "48": "icons/L48.png",
    "96": "icons/L96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/L16.png",
      "32": "icons/L32.png"
    },
    "default_area": "navbar",
    "default_popup": "popup/popup_commands.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "139.0",
      "id": "{ddcbe6bf-69f5-4769-a10e-5aff6acc3b58}"
    }
  }
}