Foxfire made some changes recently that may be the source of the problem, or it could be something to do with the Barn web site. I am thinking as a detective, trying to pinpoint the guilty party. If the Barn site works OK with another browser than there MAY be something at issue with Foxfire, or the combination of the Barn software and Foxfire. If you get the same problem with another browser then you need to contact the site administrator for the Barn.
I like Firefox and use it exclusively except for the few sites that it does not work on. There are some sites that are tested only on other browsers and they don't conform to universal rules for web sites. It used to be that a lot of sites were developed on Windows computers using only Microsoft applications and would not work on other computers and with other browsers. Microsoft had their own standards that did not conform to the universal standards. Most of that has gone away now, but there are still some holdouts.