If this is posted elsewhere I apologize, I was unable to find a solution. Transferring my local profile into Portable Firefox has never worked. At this point I understand there may be incompatible extensions, but ambiguous terms like "except cache directory" may be confusing me. I only see an extension.cache "file." Is there some specific file to file instructions, or possibly a diagram showing the correlating directory tree between local Firefox and the portable version, i.e. some way to match a particular local folder with its replacement portable version so I can copy my working profile? I recently downloaded the U3 version and need to know how to very carefully manipulate the two profiles. Thanks for any help.