From YPPedia

Certain web browsers have special issues with the wiki or with file types on the wiki.

Browsers on Microsoft Windows

• Internet Explorer
  • PNG images with transparency will now show as having transparency.
  • Horizontal leagues created with the {{chart}} ^(Usage) templates don't display properly.
  • All versions of IE have problems with text sizes, but should work fine with the default skin. Textboxes may be too wide on other skins, or font sizes may be illegible.
  • There are some special character (ISO, etc.) issues.
• Mozilla Firefox (formerly Mozilla Firebird and Phoenix)
  • Edit button missing for some sections of pages with infoboxes for Firefox 1.0.4
• Netscape
  • Very old versions cannot edit long pages (like Release).
• Opera
  • Very old versions cannot edit long pages (like Release).
  • Edit button missing for some sections of pages with infoboxes for Firefox 1.0.4

Broswers on Macintosh Systems

• No additional problems reported.

Browsers on UNIX/Linux

Other than platform limitations, no additional problems have been reported.