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Add-on of Kaspersky; Firefox disabled it

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I installed latest Kasprsky on Windows Vista Dell Studio 17 laptop. Add-on in disabled for Kaspersky. I do not know what version of FF is running; how do I find out? I need to do secured stuff and am leery about using Kaspersky when it is not showing secure site.

I installed latest Kasprsky on Windows Vista Dell Studio 17 laptop. Add-on in disabled for Kaspersky. I do not know what version of FF is running; how do I find out? I need to do secured stuff and am leery about using Kaspersky when it is not showing secure site.

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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. You can set xpinstall.signatures.required to false to disable this security feature in Firefox 43. In later Firefox% release and beta builds (47+) you may not be able to override this anymore.

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