Firefox is blocked

Hello

Since few days my firefox blocks himself after few minutes of use.

I tried scan norton, a-squared: nothing. I decontaminated all the modules complementary to firefox, that does not change anything either.I have uninstall and reinstall the Firefox and always similar.

somebody have an idea? I am under Vista, with the last version of firefox, and it is the first time that I am confronted with such a problem.

Thank you in advance.

Hello.
Is it happens with all sites?

Normally on your PC you have Internet to explore installed with your configuration.So try to test the sites problem with IE.

Go into firewall settings click on firewall and remove firefox from the list, then add it again through "add..." , and use the firewalls like nortan etc,.

Some Firefox users block ads, denying the site owner ad revenue. Therefore, they block all Firefox users, including those without ad block. Makes sense. So if you are using any ad blocker then uninstall it and then again try to surf those sites.