What version of Everquest are you using? SoD or Underfoot? Since it is Steam related it would need to be one of those clients with a certain build date. SoD should be Dec 19, 2008 and Underfoot should be June 8, 2010. Any other build date for the Steam client is likely not compatiable. If you are using Underfoot then just redownload it from Steam and you should be set.
The fact that Everquest is calling a dll used with Firefox is not all that odd given that the Steam versions of SoD & Underfoot have a mozilla folder in the Everquest directory. I even checked a backup of live from earlier this year and it contains the same files. What exactly it is used for is beyond me but that is a different story all together.
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