Editor Loads in IE but not in Firefox
Firefox is a wonderful browser, streamlined, fast, efficient, and secure. But it can turn into a slow, inefficient resource hog when too many poorly designed extensions and addons are installed. In this case, the problem is that the TinyMCE or FCKEditors (WYSIWYG = What You See Is What You Get) editors would load fine in IE, Mozilla, and other browsers, but not in Firefox. At first it appeared that this issue was specific to the FCK and TinyMCE drupal modules, but then it turned out that not even the demo's on the FCKEditor and TinyMCE pages would work. In other words - FCKEditor and TinyMCE work fine in recent versions of all the major browsers. The problem below is a result of a conflict with other extensions:
Error: navigator.appVersion.match(/MSIE (.\..)/) has no properties Source File: http://www.<domain-name>.com/modules/fckeditor/fckeditor/fckeditor.js Line: 144 </domain-name>
The Solution - Fresh Firefox Profile
The solution involves a Fresh install of Firefox, and in some cases a new profile. If a re-install of the Firefox executable (into a new folder) does not solve your problem, you may need to reinstall your profile. First back it up by renaming the "Firefox" folder (instead of deleting it) to "Firefox-bak" in the following folder:
C:\Documents and Settings\USERNAME\Application Data\Mozilla
This is for Windows systems - replace USERNAME with your username. Now when you reinstall Firefox a new profile will be generated and you should no longer experience the above error. Please post any comments or questions below.