It's All Text! - Edit textareas in your browser with your favorite editor!
I migrated my firefox install from one computer to another a year or so back, changing usernames in the process. The cache folder for this addon was still set to /home/olduser/.mozilla/[etc], but instead of giving some kind of indication that it wasn't able to find/make the folder, it's just been failing silently all this time. Perhaps it can be similar to the error that pops up when the editor binary/script can't be found.
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be still under discussion. The issue was opened by Gotolei and has received 1 comments.