Hello, Flood. I´m sorry for the lapse. I´ve been very busy in the last days. I´m still dealing with the KPM issue. I´ll answer your last message now: 1. Ok 2. I did it. 3. It really doesn´t exist, but in one of my trials to solve the problem, I´ve downloaded the xpi file from this forum. Someone provided it in another conversation. I already lost that file (the downloaded one) and the link of the conversation. Sorry if I didn´t make myself clear. 4. No. I don´t even know it. Should I try it? 5. Try, you mean, unninstall and install all again? Just another information: I have two computers: a desktop and a notebook (the problem occurs only on the notebook). Both have almost the same configuration (i7, Win 10), and both has the same Mozilla and Kaspersky version. The KPM works fine on the desktop.