How to get the previous URL after using window.history.back?

I've been using Mozilla Firefox 3.5.3 but recently I get the error "The URL you requested has been blocked".?

Previously I was using Windows Vista Home Premium (Service Pack 1) and I upgraded it to Service Pack 2. Since then then this error message keeps coming up so I can't use it anymore. I saw an answer to a similar problem here, on Yahoo Answers and I've tried it but it doesn't work. I even uninstalled and reinstalled it. It still doesn't work. I have the same problem with Safari 4.0.3. Please help me.
Answer:

It could be either Windows or your ISP blocking the website, eitehr because it is harmful or because it contains illegal content. It might be worth googling the error message, chances are many people have ahd the same problem

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Other answers

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