Hi Marco,
> I installed ungoogled-chromium. When it starts and I browse to the > main Jitsi instance [1], it wants to install the extension for Google > Calendar and Office 365 integration. I don't know if those are > non-free softwares, but they at least provide non-free web services. It seems to me that these suggestions are triggered by the website. We don’t attempt to filter website contents. -- Ricardo