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Firefox is on the brink of being dropped by the US Government
(www.brycewray.com)
This is a most excellent place for technology news and articles.
If they are visible in plain text without a master password, then it's not very relevant. I just tested this on my work laptop with a shared key I have stored in there and it didn't require any master password, nor was I prompted to set one up when I originally installed chrome three months back.
Oh I don't know about Chrome, I should have specified that I use Firefox