A way to always have a clean session (no tabs) everytime Firefox starts?

For my needs I must have only one tab open when firing Firefox.
I've tried the following parameters in ''about:config'':
* browser.sessionstore.enabled = false
* browser.sessionstore.max_concurrent_tabs = 1
* browser.sessionstore.max_resumed_crashes = 0
* browser.sessionstore.resume_from_crash = false
* browser.tabs.loadInBackground = false
However, it occasionally opens two or three tabs when I start Firefox.
It is usually closed by killing the process, but that shouldn't be an issue as it's told to not store the sessions and not restoring them after a "crash".
Is there something else I should look at?
Thanks a lot in advance.
PS: Although they aren't listed in the troubleshooting information below, the aforementioned parameters do actually display as modified in about:config.

Firefox 4 will always try to restore a session if you let it crash by killing that process because that leaves a file sessionstore.js with a running flag. Firefox 4 uses sessionstore.js to store the App Tabs and Panorama tab groups, so if you use any of those then they get lost. If Firefox is closed properly then the last session can be restored via the History menu or a button on the about:home page.
You can try to launch Firefox with one specific page by adding that URL to the command line in the desktop shortcut. I haven't tested if that works with a forced close, so you have to try that yourself to see if that works.

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