How to I have restart Firefox without restoring a previous session?

Whenever I encounter a suspicious site (like a fake antivirus, redirection porn site, etc.), I'll close Firefox 6 using the Task Manager (CTRL-ALT-DEL then Applications / Close). I do this because sites often suspicious Web you don't have to click on something before you can close your browser [example: are you sure you want to exit this Web site?] Yes/No]. I don't want to click on anything that may install malicious software.
After forced when I re - open Firefox, it attempts to restore my last session automatically. This of course re - opens the same suspect site and I have to close Firefox a second time with CTRL-ALT-DELETE. After this second termination constraint I get the page "well, it's embarrassing" and I can choose to start a new session.
My question: is it possible to stop Firefox to automatically restore a session of old when it is closed or force terminated?
By the way... In Tools/Options/general/start, I set to 'Show my home page' at startup.

Set the browser.sessionstore.max_resumed_crashes pref to 0 on the about: config to get page the on: sessionrestore page immediately with the first reboot after a failure has occurred or the Task Manager was used for the closing of Firefox.

Which allows to deselect the tabs that you do not want to reopen, but will reopen the other tabs.

See:

Tags: Firefox

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