How can I start Firefox in a brand new session?

I got onto a malware site that wants to scan my computer for viruses. There is currently a popup window that says "Threat Detected. Please click the Protect button to make your system safe." I don't want to do that.
I can't close the popup by clicking the 'X' in the upper corner. No other options are available in Firefox. Everything is disabled until I press Protect.
I restarted the computer and restarted Firefox, and the first thing I see is "Threat Detected".
So I want to start a new session so the malware Tab won't open from the previous session.
(I'm using Google Chrome to post this.)
Many thanks....

Delete [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder] to make Firefox forget the previous session.
You will have to redo App Tabs and Tab Groups after deleting sessionstore.js.
See:
* http://kb.mozillazine.org/Session_Restore

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