Could you check whether it is among the available icons on the Customize tab? This article will get you to that page:

Customize Firefox controls, buttons and toolbars

If it's not there, could you check the extension's Options in case something needs to be turned on there. Pull up the Add-ons page using either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions.

Then find that extension on the right side and click its Options button. Anything?

You might also check with Kaspersky support. I'm having difficulty tracking this down on their site.

Thanks, but of course I checked ALL of that many hours ago. Kaspersky IS working through Firefox when I use Firefox for Google searches, And of course it is working in Chrome.

I happen to like Firefox but now I don't trust it. The problem lies with Firefox, NIOT Kapspersky, or maybe the Chrome programmers are just smarter and more diligent!

I think it is extremely SIGNIFICANT that Firefox claims that the Kaspsesky file is "corrupted". Chrome doesn't think so and neither does Goggle (the software in each must be slightly different, as one is a browser and the other a search engine()

If the Kaspersky extension is not installed, but you have Kaspersky markers in your Google results, that may be a result of using the HTTPS scanning feature in Kaspersky.

Is there a feature within Kaspersky to set up browsers? That may be a better way to install the extension than via download.

Also, if you haven't restarted Windows since you reinstalled Firefox, you might want to try that, to completing any deferred updates and allow Kaspersky to do its startup check for new software.

Thank you for your thoughtful help and suggestions .....

However it is now FIXED! Re-installed KIS 19

Either it was in fact corrupted as indicated or in the interim made compatible by Kaspersky with new Firefox version