Why does Mozilla Firefox hang after switching to Windows 10?

Question

Windows

Hello!
I noticed that after switching to Windows 10, the Mozilla Firefox 42.0 browser began to consume CPU resources heavily. In idle time, it can reach up to 40-50%, the browser slows down accordingly, there are a little about 50 tabs.
The standard procedures described on the network: clearing the cache, disabling plugins, deep picking configs through about:config, and so on, did not give any results.
PS The problem is in the add-on from Kaspersky, which is integrated into the browser and does not turn off in the usual way.

Answer 1

Have you tried updating Mozzila after the transition? or completely uninstall and reinstall from off site

Answer 2

Clean your browser with this utility - AdwCleaner