Compared to the pre-57 Firefox version, this one sucks.
I used this add-on before F. 57.0 and gave it 5-stars. I was waiting for a version for Firefox 57. I'm glad Save-Text-to-File 3.1 finally arrived. I do use it daily.
However, I'm disappointed in this release. Simple, but valuable features have been left out. Most importantly, you can't designate a your own default directory for the text files. Instead, they all go into the download directory by default. I could only change the directory for the current message, not for all. Why?
Moreover, you can't tell it to append text to an existing file. STtF 3.1 also isn't intelligent enough to put a number on successive text files made on the same day from the same site.
The app had all of these features before. They would seem simple enough, why have they disappeared?
I was disappointed enough to be tempted to give this two stars, but that implies I don't use this add-on. In fact, even with its missing features, I still do. It has 50% of what I need and I can work around the rest.
It's just functional enough to be useful.