I have the same problem. It is the latest version of the Kaspersky Protection Firefox Add-On (2.4.33.0) causing the issue. I've checked 2 PC's and both are affected. The previous version of the Add-On worked fine.
I am also having the same problem with the latest version of Firefox and Kaspersky extensions and agents. When enabled, the extension will consume up to 70% of CPU. Restarting Firefox resolves it for a short time, but within a few hours, the same problem happens.
CPU problem started for me on Monday 24th, ie date of new FF extension - I have 8 windows with 100ish tabs total that I have to reload with "Restore Previous Session" when I repeatedly have to close and restart FF, running on i5-4690 3.5Ghz with FF Extension version 2.4.33.0.
I reported this problem by chat on Monday May 1st and gave pretty clear description of how disabling and reenabling the Kaspersky FF extension reproducibly changes the CPU use by 35% approx for me. [In Windows TM with the extension enabled I see two serious CPU hogs from FF, one runs at about 25% and the other at 10%]
I was told to perform some diagnostics with first Exiting, then Pausing protection, then (if problem was stopped by Pausing) selectively disabling stuff. Oddly no warnings about risks of disabling Kaspersky while online, I did my tests with network disconnected. And also oddly no diagnostics of the FF extension requested in the script.
As Pausing the protection did not stop the problem and the diagnostic script said to do no more tests but to advise I did that, by email later, and also added comments to restate the reproducible effect of disabling and reenabling the FF extension.
Looking in Windows TM I also notice that FF has an "undulating" memory use that varies by several GB over 10s of minutes, I think this was happening before the CPU problem started, but it does seem to go away when the extension is disabled. This also happens even when the network is not connected.
And please provide more clarity as to when it will actually be available. It is already midday in the UK, seven hours since your post above, but I see no update, will we get a version today? And are you saying that the FF extension will not update itself automatically? If so why not?
Perhaps you could also explain why your various support people, well the ones I dealt with, took so little interest in believing there was a fault within the Kaspersky FF extension, despite the various threads and posts about it here and my informing support of the other posts and providing quite detailed information. No real interest was taken in the real crux of the problem involving the FF extension, despite clear evidence that simply disabling and reenabling it was the crux of the issue and that it wasn't some more general AV issue.
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