Hi David, the first and third trps are familiar. I think that Mozilla keeps a list of fonts, perhaps including attributes and other stuff in the pldhashtable and now and again it gets corrupted,perhaps by something weird in a font, perhaps for some other reason. I don't have the skills to say much more then that.
They seem to happen here perhaps once a month on average, they'll be a couple within days and then no more for a couple of months. I've seen it in SeaMonkey and Thunderbird. Something to live with I guess.
The middle one, 0048_23.trp, is one I've never seen. Our TCIP stack seems to have had a problem looking up a host name, possibly netflix or something netflix loads. Not sure if caused by FF passing corrupted data or what. Hopefully it is a one time thing.
Are you using a hosts file to block ads? If so, you might want to review it for any weird characters.