Hi Flood, Thanks for the reminder, though I prefer using Vivaldi, and for now will just keep this Kaspersky extension turned off. Thanks for the heads-up about Kaspersky Password Manager. Meanwhile, I'm pretty sure this extension was once working fine for me in Vivaldi, but hasn't for a long time. I just never got around to posting anything about this extension issue till I saw the it mentioned here again. The likely fact that it was working and now isn't seems to be the main issue here, and similarly among some of the commenters on the extension's Chrome Store page too. (FWIW, and as you no doubt know, Vivaldi is Chromium-based too, just as MS Edge, Brave, and Google Chrome are, so hopefully Kaspersky eventually does support it fully.) In case it matters, I notice that I and the others posting here are using Chrome ver. 87.x, which is beyond the ver. 85.x that this Kaspersky page says it supports for KIS. Also, the supported HW/SW page for KIS that you linked to has the line "Newer versions of browsers can be supported if the browser supports the corresponding technology." Although this line makes it sound a bit vague about what exactly is supported in the end, could that maybe be an issue here too? Thanks again.