You can use Private Browsing mode as that doesn't store session data in the profile folder.

• https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history

You can use Private Browsing mode as that doesn't store session data in the profile folder.

• https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history

Thank you very much!

This will work, but I'm concerned that then I will have to live with any limitations and restrictions that come with Private Browsing mode. Perhaps that won't be a problem, but I'm not sure.

However, this solution now got me thinking about another possibility ...

Where exactly in the profile folder is the session data stored? Perhaps I could always use a script to launch Firefox, with this script deleting the session data before performing the actual launch.

Is this a possibility?

You can possibly make the sessionstore-backups folder read-only.

You will normally find these files in the sessionstore-backups folder:

• previous.jsonlz4 (cleanBackup: copy of sessionstore.jsonlz4 from previous session that was loaded successfully)
• recovery.jsonlz4 (latest version of sessionstore.jsonlz4 written during runtime)
• recovery.baklz4 (previous version of sessionstore.jsonlz4 written during runtime)
• upgrade.jsonlz4-<build_id> (backups created during a Firefox update)

You can copy a file with Firefox closed from the sessionstore-backups folder to the main profile folder and rename the file to sessionstore.jsonlz4 to replace the current file, sessionstore.jsonlz4 is only present when Firefox is closed.

You can possibly make the sessionstore-backups folder read-only. You will normally find these files in the sessionstore-backups folder:

• previous.jsonlz4 (cleanBackup: copy of sessionstore.jsonlz4 from previous session that was loaded successfully)
• recovery.jsonlz4 (latest version of sessionstore.jsonlz4 written during runtime)
• recovery.baklz4 (previous version of sessionstore.jsonlz4 written during runtime)
• upgrade.jsonlz4-<build_id> (backups created during a Firefox update)

You can copy a file with Firefox closed from the sessionstore-backups folder to the main profile folder and rename the file to sessionstore.jsonlz4 to replace the current file, sessionstore.jsonlz4 is only present when Firefox is closed.

Thank you again, very much! This is a very promising possibility, and I will work on it during my spare time over the next few days and then report back here with my findings.

I am very upset with the Mozilla people for forcing us to go to such lengths simply in order to be able to always launch a fresh invocation of Firefox upon startup, if we so choose.

Yes, of course I know that the vast majority of Firefox users don't mind being forced in this way, but at least Mozilla should provide an *option* (perhaps in "about:config") so that the small minority of us who don't want this startup behavior to be shoved down our throats can *optionally* disable it.

But no.

Thank you, Mozilla, for being so awful and condescendingly paternaiistic to the Firefox user base.