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Upgrade kills add ons even virus program

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latest update disables Kaspersky. Every update kills some add on that I use. The more I use Firefox the more I am frustrated

latest update disables Kaspersky. Every update kills some add on that I use. The more I use Firefox the more I am frustrated

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Hi softus, did you see the article linked in your earlier question? https://support.mozilla.org/questions/1099817

I'll go ahead and repeat what you can learn there:

Kaspersky has not yet gotten its extensions signed by Mozilla, so the signing requirement is blocking them. You can make a temporary exception to the signing requirement -- this is global for all extensions, there's currently no way to only make an exception for specific extensions.

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste xpin and pause while the list is filtered

(3) Double-click the xpinstall.signatures.required preference to switch it from true to false -- note that this is for Firefox 43 only