How do I PREVENT tabs/sessions restoring when restarting Firefox after a forced close/crash?

So... I'm running, say, a Google search, and I click on a link I think will be useful. But unfortunately, I've been taken! I get redirected to some scary Website I don't want to be at. I try to close the page, but a dialogue box pops up saying, "But wait! Don't you want to download our dangerous trojan horse? Y/Y?"
I don't want to click ANYWHERE on the dialogue box for fear of making the stupid situation I've gotten myself into worse. I can't close Firefox because it's "waiting for a response from you" so I force-close it from Task Manager. Whew!
EXCEPT then when I restart Firefox, it "helpfully" tries to restore my session... with the scary site with the scary dialogue box.
If I force a close a second time with Task Manager, Firefox fails to restore it again, so I can continue on my merry way and remember to be more careful on my searches, but it's damned annoying when it happens!
How do I make Firefox NOT want to restore sessions/tabs? All support info is about ENSURING session restoring, not prevent it!
And frankly, I can't think of a single time I'd actually want to restore a session after a crash. Worse comes to worse I'd rather just start from scratch anyway.
This doesn't happen often (I like to think I'm not entirely a moron and can avoid obviously harmful sites most of the time), but it's annoying when it does. I can keep Task-Manager closing until it won't restore, but I'd rather just have nothing restore at all!

You can do this by changing a hidden preference.
# Type '''about:config''' into the location bar and press enter
# Accept the warning message that appears, you will be taken to a list of preferences
# In the filter box type '''resume''' to bring up a small number of preferences
# Double-click on the preference '''browser.sessionstore.resume_from_crash''' to change its value to '''false'''
That change will stop Firefox trying to resume the session after a crash

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