1. 4浏览
   1. up体验
      1. No Squint
      2. Adblock Plus
      3. CustomizeGoogle
      4. Fission
      5. FoxyProxy
      6. Locationbar²
      7. NoScript
      8. Right Encoding
   2. up效率
      1. Autocomplete Manager
      2. Copy Link Name
      3. Copy URL +
      4. Flashblock
      5. It's All Text!
      6. MR Tech Toolkit
      7. SwiftTabs
      8. Tab Mix Plus
2. 4应用
   1. Google
      1. Better GCal
      2. Better Gmail 2
      3. Googlepedia
      4. GUtil!
   2. 桌面
      1. CHM Reader
      2. Pearl Crescent Page Saver Basic
   3. 下载
      1. PDF Download
      2. MLdonkey Protocol Handler
      3. DownThemAll!
   4. 上传
      1. Firefox Universal Uploader (fireuploader)
   5. TwitterFox
   6. Access Flickr!
3. 4开发
   1. Console²
   2. Google Gears
   3. SQLite Manager
   4. Greasemonkey
   5. Web Developer
4. 4fun
   1. Show Location
   2. ColorfulTabs
5. 4火狐
   1. FEBE
   2. Stylish
   3. Extension List Dumper
   4. Extension Manager Extended
   5. Fasterfox
   6. Nightly Tester Tools
6. 4KM
   1. ScrapBook