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firefox opens 4 windows on start

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Every time I open Firefox now, it launches with 4 windows. One is a normal window (showing the site I was on last), and 3 are blank windows with double title bars and an orange Firefox tab. I can't see what's causing this, or how to correct it..?

Every time I open Firefox now, it launches with 4 windows. One is a normal window (showing the site I was on last), and 3 are blank windows with double title bars and an orange Firefox tab. I can't see what's causing this, or how to correct it..?

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You can check:


This can be a problem with the file sessionstore.js and sessionstore.bak in the Profile Folder

Delete sessionstore.js and sessionstore.bak in the Profile Folder If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.

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