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This is just a shim to add back in GM_addStyle for scripts in @grant none mode, or that run on benighted engines without native GM_addStyle support.
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.org/scripts/44560/271595/GM_addStyle_shim.js