不必诧异，这是真的。只要你安装了 CHM Reader 这个 Firefox 扩展，你一样可以办到。
下载 CHM Reader 扩展。
直接使用 Firefox 打开，然后按提示安装，并重新启动 Firefox。
通过 文件 -> 打开 CHM 文件 菜单命令开启需要阅读的 CHM 电子书。
从 查看 -> 侧边栏 -> CHM Reader（或直接按 Ctrl+E 快捷键）可以打开该 CHM 电子书的目录。
需要注意的是，此扩展仅支持 Linux x86 下运行的 Firefox，且无法对除中英文之外的 CHM 进行查看。
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