Rated 2 out of 5 stars
Unfortunately there's no possibility to recover text if browser crashes and you have to re-login on a website. The add-on always uses the same text file for a webpage and deletes its content as soon as you navigate to a different page.This review is for a previous version of the add-on (1.3.1).
The textfile shouldn't be deleted until Firefox quit (or restarts after a crash).
So after a crash, you could copy all the files out of the itsalltext directory in your profile and then copy them back after FF has restarted.