我正在创建一个 Firefox 扩展。我想使用 localStorage 作为整个浏览器的全局变量。但它仅适用于保存它的选项卡。我无法在其他选项卡中读取此值。我如何使它可以从任何选项卡访问，或者可能存在哪些问题？
我像这样使用它：
localStorage.getItem('variable')
localStorage.setItem('variable','value')
更准确地说，我在页面加载时将 javascript 代码注入到页面中。从注入的代码中，我想将我的值保存到本地存储。
标签有不同的网址。我的代码在页面加载时尝试使用本地存储。但它检查 localStorage 值是否存在，如下所示：
if(localStorage.getItem('variable')){ ... }
我认为您不能localStorage用作全局变量
localStorage is also the same as globalStorage[location.hostname], with the exception
of being scoped to an HTML5 origin (scheme + hostname + non-standard port) and
localStorage being an instance of Storage as opposed to
globalStorage[location.hostname] being an instance of StorageObsolete which is covered
below. For example, http://example.com is not able to access the same localStorage
object as https://example.com but they can access the same globalStorage item.
localStorage is a standard interface while globalStorage is non-standard so you
shouldn't rely on these.
Please note that setting a property on globalStorage[location.hostname] does not set
it on localStorage and extending Storage.prototype does not affect globalStorage
items, only extending StorageObsolete.prototype does.
考虑使用globalStorage，然后localStorage在需要的地方设置。
来源：https ://developer.mozilla.org/en-US/docs/Web/Guide/DOM/Storage#localStorage