[OrvalWintermute]

I think they are complementary, since one is about browser site isolation, and one is about process isolation on the computer.

Using temporary containers, multi-account containers, site isolation, along with a number of other privacy/security addons such as Umatrix, LocalCDN, and many others, I have not noticed any slowdown.

This on an older broadwell i7 with 32GB of ram.

[jedberg]

So far it seems to work fine for me too. Can you share you list of security/privacy addons? I've used Umatrix but never heard of LocalCDN. Was wondering what other gems you may have found.

[OrvalWintermute]

Here is a complete list of security/privacy addons I am using, a small number of which I have disabled, as I regularly toggle them depending on what I am doing at the time

AdNauseam

Archive Page

ClearURLs

Cookie AutoDelete

Cookie Remover

Decentraleyes

DoH Roll-Out

Don't track me Google

DuckDuckGo

Facebook Container

Firefox Multi-Account Containers

Firefox Private Network

Firefox Relay

Firefox Screenshots

First Party Isolation

Google Container

Google search link fix

Greasemonkey

HistoryBlock

HTTPS Everywhere

I don't care about cookies

Laboratory

Link Cleaner

LocalCDN

PinPatrol

Privacy Badger

Privacy Pass

Redirect AMP to HTML

Skip Redirect

Tampermonkey

Temporary Containers

Trocker

Twitter Container

uBlock Origin

Ugly Email

uMatrix

Wappalyzer

Zoom Redirector