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firefox is blocking me from downloading seobook tool bar and rankchecker

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I'm trying to download rankchecker, seotoolbar and SEO for Firefox from http://www.seobook.com/download-your-free-seo-tools/ and firefox is preventing me from doing so? How do I fix this? Lisa

I'm trying to download rankchecker, seotoolbar and SEO for Firefox from http://www.seobook.com/download-your-free-seo-tools/ and firefox is preventing me from doing so? How do I fix this? Lisa

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Preventing the download, or the install? What messages do you see?

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Hi Fred, Thanks for your reply. The message is Firefox has prevented this site from installing an unverified add-on. Cheers, Lisa

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Current Firefox releases require extensions to be signed to prevent abuse by malware. In Firefox 43 unsigned extensions will be disabled by default.

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