I dl and installed and tried out both Mime edit extensions from the add-ons section so that I could add instruction re txt docts. Believe it or not, I need Firefox let an external application handle text files because of the nature of info I have in them that the text editor I use handles better. Besides which word wrap is dealt with in an editor whereas FF just uses long sentences. For these 2 reasons I made the change but though the TXT extension now shows up under FF's file types, Firefox continues to open any txt documents despite that.
How can this be fixed irrefutably? I really need to be able to do this.
Thanks much. 
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This is less of an issue with the Portable version than Firefox itself. I would suggest bring this up on the Firefox support website - they are more likely to have an answer.
Also, why not just download the text file and use your editor to open it; that is what I do. You can always delete it afterward.
good luck!
I'm getting ping-ponged! Each forum says to see the other .
At any rate, I dl another extension and that _seemed_ to have done the job.
Thanks. :oD