I like to keep my PC (and Firefox) logged in for weeks. When I start Firefox, it asks for my master password the first time I need a password I have saved. After that, it always automatically fills in each password.

Can I reset it so that it will go back to prompting me?

Not every time, just the first time after the reset.

This way I can re-lock my session overnight. I know I could simply shut down firefox and restart it but I don't want to do that as I often keep lots of windows open to remind me the next day what I was working on the night before.

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What does switching to private browsing and back do? – MBraedley Aug 28 '11 at 21:41
That seems to do the trick. Submit an answer so I can accept it. – Adrian Pronk Aug 28 '11 at 21:54
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3 Answers

up vote 2 down vote accepted

You can use the Master Password Timeout extension.

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You can switch between normal browsing and private browsing and then back. All your tabs will still be there, but you'll have to re-enter your master password.

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I like the look of the later answer suggesting Master Password Timeout. I'm going to evaluate that before I accept an answer. – Adrian Pronk Aug 29 '11 at 6:37
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Apart from the extension mentioned by grawity you can do it manually by going to Tools > Options > Advanced > Encryption > Security Devices, then select "Software Security Device" under "NSS Internal PKCS #11 Module". Now click on Log Out button.

http://kb.mozillazine.org/Master_password

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