1. ZHUO Qiang
  2. chmfox



ChmFox: Firefox Extension for Viewing CHM files

ChmFox is a Firefox extension which brings the best CHM file reading experience to all platforms. CHM file could be viewed directly in Firefox using this extension under Windows, Mac and Linux.


  1. Download and install ChmFox here
  2. After installation, restart Firefox to make ChmFox work
  3. Open CHM files through Menu -> File -> Open
  4. You could make firefox the default program for opening CHM file, after doing that, just double click CHM files and enjoy ChmFox
  5. There's a sidebar for the CHM file content/index, you could use hotkey Ctrl+Alt+m (or Command+Option+m under Mac) to turn it on/off
  6. ChmFox remembers and jumps to the last reading position when re-open CHM file and you could always bookmark as many CHM pages as you like using Firefox's build-in bookmark function
  7. Zoom the page by Ctrl + / Ctrl -, just as normal web page. ChmFox remembers the page zoom level per CHM file

Build It Yourself

ChmFox currently support following platforms

  • Windows (x86, x64)
  • Mac OS X (x86, x64)
  • Linux (x86, x64)

If your platform is not supported, you could always build it yourself

  1. Download source code
  2. A C compiler and SCons build system are required on your system to build the source code
  3. Add new platform directive in file ./chrome.manifest
  4. Run the command "scons xpi" under the source tree, if everything is OK, you could find the final xpi file under ./build directory
  5. Drop author an email to help add that platform to the offical build so that others could benifit as well

Setup Development Environment

In addition to setup general Firefox extension development environment,

you could also point your Firefox extensions directory to your extension

  1. First find the profiles directory. On Mac all profiles are under

    ~/Library/Application Support/Firefox/Profiles/
  2. Then choose a specifix profile. You could see all profile name and their location in

    ~/Library/Application Support/Firefox/Profiles/profiles.ini
  3. Next add a text file chmfox@zhuoqiang.me inside the extension directory of the profile you are choosing, for example:

    ~/Library/Application Support/Firefox/Profiles/2al7gpp8.dev-edition-default/extensions/chmfox@zhuoqiang.me
  4. Add single line in that file, which will point firefox to the local chmfox source directory (with / at the end)

  5. restart firefox and you have installed the local chmfox. All changes in source code will be effective without build


ChmFox is open sourced under MPL 1.1/GPL 2.0/LGPL 2.1

Help make it better

If you like ChmFox and want to help make it better, you could



  • Pure javascript extension without and C/C++ code
  • Restartless
  • Web UI for search/index

ChmFox: 查看 CHM 文件的火狐扩展

ChmFox 是一款火狐浏览器扩展。它给所有平台带来最好的 CHM 文件阅读体验。使用这款扩展,你就可以在 Window, Mac,以及 Linux 上直接使用火狐浏览器阅读 CHM 文件


  1. 先在这里下载安装
  2. 安装完成后,重启火狐浏览器让扩展生效
  3. 通过菜单 -> 文件 -> 打开文件 直接打开 CHM 文件
  4. 更方便的用法是:将 CHM 文件的系统默认打开程序设为 Firefox,之后双击 CHM 文件系统就自动以 Firefox 打开
  5. 有一个专门显示当前 CHM 文件目录和索引的侧栏。可以使用热键 Ctrl+Alt+m (Mac 下为 Command+Option+m) 快速开关
  6. 智能记忆上次阅读位置,下次打开文件时自动跳转,让您接着读。您也可以使用火狐本身的书签功能为 CHM 文件任意添加书签
  7. 和普通网页一样,可以使用快捷键 Ctrl + / Ctrl - 缩放页面. ChmFox 能记住每个 CHM 文件的缩放等级


当前 ChmFox 支持以下平台:

  • Windows (x86, x64)
  • Mac OS X (x86, x64)
  • Linux (x86, x64)

如果你的平台不在其中,你完全可以自己编译 ChmFox

  1. 下载源代码
  2. 系统需要安装 C 编译器和 SCons 构建工具
  3. 在 ./chrome.manifest 文件中加入新平台的指示语句
  4. 执行命令 "scons xpi", 如果一切正常你会在 ./build 目录下找到最终的 XPI 文件
  5. 别忘了给作者写封信,把该平台的支持加入官方安装包中帮助更多的人


ChmFox 是开源项目,使用 MPL 1.1/GPL 2.0/LGPL 2.1 版权


如果你喜欢 ChmFox,想帮助它更好的发展,你可以