So, for a good chunk of the afternoon, I went around looking for a Firefox plugin that displays the .mol file format. I did not have much luck. I only found plugins for IE and Netscape. File Menu
The MOL file format is defined by MDL (Molecular Design Ltd). A MOL file can describe a chemical structure, but no properties and references. For further detail, see the manual 'MDL CTfile Formats' provided by MDL.