That indicates a character that does not exist in the font being used to display it. It could be a special symbol from a Word processing program, or a bit of file corruption on the site, or it could indicate a problem with that particular font on your system.

Can you post an example URL or two showing the problem?

Which encoding is selected when you see that symbol?

Is that an 8 bit Western or Windows encoding or Unicode?

• Firefox > Web Developer > Character Encoding
• View > Character Encoding

I am using unicode.

Can you post a link to a page where you see it?

It is possible that the FF FD character is in the page code as a result of pasting source data from an 8 bit (ANSI) source in an Unicode file.

I will post when I find one. The last time I was reading an article on yahoo and when I scrolled to the comments below there was the FFFD in the middle of many of the words. Thanks

A very common cause is the presence of 0x80 - 0x9f characters from a Windows encoding to add quotes.
Unicode and Western (ISO-8859-1) do not have characters in that range.

• http://en.wikipedia.org/wiki/ISO/IEC_8859-1
• http://en.wikipedia.org/wiki/Windows-1252

https://addons.mozilla.org/en-US/firefox/addon/netvideohunter-video-downloade/reviews/?src=api

I am seeing something similar to the FF FD thing....these are various letters. But this is an instance where I am reading posted reviews instead of the posted comments as mentioned previously.

Do you mean that you see the little boxes with text like this: 任何音乐视频都能快速下载。(｡▰‿‿▰｡) ?

You may be missing fonts to display such text or may need to install East Asian language support.

• http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/int_pr_install_languages.mspx?mfr=true - Microsoft Windows XP - Install East Asian language files on your computer

This fixed my problem....thank you so much!

You're welcome.