Hi,

Try

https://support.mozilla.org/en-US/kb/settings-privacy-browsing-history-do-not-track?esab=a&s=+private+browsing+retaining+form+history&r=2&as=s

Regards Deepak Krishnan P.R

Those settings apply to regular widows and works correctly there. Private windows are not supposed to keep form history when the window is closed.

Do you also keep this history when you close and restart Firefox?

Are you sure that you haven't visited the site before in a normal session? I'm not sure if form data is stored site dependent or only as connected to an input field with a specific name (there is a GUID (hash) and a fieldname present with SQLite Manager in formhistory.sqlite)

Note that in PB mode you have access to stored form data from a regular session, but you can't delete it as long as you are in permanent private browsing mode (never remember history). You would have to open a regular session and visit the site to remove that data or use "Clear Recent History"..

Even in a regular window when I Clear Recent History selecting Everything for the time range the form history is not cleared. Is this a bug in Firefox 31?

Try to rename (or delete) the formhistory.sqlite file in the Firefox profile folder to clear all stored saved form data.

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox

I can't delete the file because it's locked by Firefox.