I let my Macbook die and now it doesn't recognize old wifi connections and doesn't trust internet.

Hi-
I have often let my Mac die, while going to sleep etc, this is the second time that when I charge it back up and turn it on it doesn't work the same.  It doesn't remember the passwords of old wifi networks that I have told to "remember this network."  Then when I do retype the password and connect there's a screen on the internet that says it cannot trust site like Facebook or Google and sometimes there's "add exception" sometimes there's not.  This is on Mozilla Firefox also.
Last time this happened I can't remember what I did but it eventually started going back to normal....But now, I don't know, any suggestions??

How much free space on the HD?  You should have 30 GB free for the system to do "temporary work", such as saving preferences and internet settings in browswers.

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