Hi, Eduardo,
they are not files in a folder, they are lines in a file.
If you want to edit them:
make a copy of the prefs.js file (in "Profiles" -> "YourProfile" (probably called something like "54jk78ud.default") as a backup.
Open that file.
Scroll down to find the lines beginning with:
Quote
user_pref("kmeleon.plugins.sessions
Alternatively, you can access the same lines via
-> Edit -> Configuration -> Browser Configuration
or by typing about:config in the URLbar, then hitting Return.
For my taste, the "edit file" method is preferable - I tend to
NOT FORGETTING to backup that way ...
Cheers
SoerenB
Back again ...