Mozilla has a Blocklist of Firefox Add-ons that are troublesome, but not web sites. *Blocklist: https://www.mozilla.com/en-US/blocklist/ Are you sure the message that you are seeing is not coming from your firewall application or from some type of parental control software? Vista also has some blocking capability based on words or type of content on web sites; you need administrator rights and possibly a password to change. If at work, your system administrator may have blocked certain sites/types of sites from being accessed by the company servers. '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------- Not related to your question, but... You need to update some plug-ins: *Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/ *Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]