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Chrome Web Store is the official Chrome web browser website for
supported exentions. However, it can also be used to install extensions
to the free variants of Chrome known as Chromium and Iridium (built on
Chromium + improved privacy).
Iridium (unstable) can be installed from:
https://launchpad.net/~strukturag/+archive/ubuntu/iridium-unstable.
Iridiums extension directory is located in
~/.config/iridium/Default/Extensions/.
However, Chrome Web Store do not show the license for the extensions
which makes it hard to verify which extensions that are free or not. You
have to install the extension and manually look into the source code of
each files in the extension directory.
I suggest that the FSF contact Google
(https://www.google.com/intl/en_us/chrome/business/devices/contact.html)
and ask them to add "License(s)" to the default text to the extensions
in Chrome Web Store so we can build a verified free repository in the FSD.