Firefox 扩展预安装检查
有没有办法在通过 XPInstall 安装扩展之前进行安装前检查？此扩展包含一个 NPAPI 插件。该 NPAPI 插件需要预先安装特定版本的库，否则安装将会失败。
Is there a way to do a pre-installation check before installing an extension through XPInstall? This extension contains an NPAPI plugin. That NPAPI plugin requires certain version of libraries installed beforehand otherwise installation should fail.
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不需要。您可以在
install.rdf中定义一些要求 - 例如主机应用程序（例如 Firefox）、应用程序版本和操作系统。在安装扩展之前，您不能要求 XPInstall 查找特定的库。并且您的扩展在安装后才会激活。因此，您应该让用户安装您的扩展并进行检查 - 如果出现问题则发出警告。无论如何，您都需要执行此操作，如果用户安装了您的扩展并随后卸载了所需的库怎么办？
No. There are some requirements that you can define in
install.rdf- like host application (e.g. Firefox), application version and operating system. You cannot ask XPInstall to look for particular libraries before installing your extension. And your extension won't become active until it is installed.So you should let the user install your extension and do the checks then - warn if there are issues. You would need to do this anyway, what if the user installed your extension and uninstalled a required library after that?