A fork of Opera Software's Chrome Web Store extension downloader extension modified to work with Ungoogled Chromium.
Do note that locales other than English and Polish aren't officially supported and will likely work but display incorrect/misleading messages and/or Opera branding. If you happen to know any of the languages left out, I'd appreciate a pull request with proper translations.
The project is currently on hold. I'm not using Ungoogled Chromium anymore and I don't have time toying around with the code. It's likely an easy fix to get it up and running, so if you find it, make sure to make a pull request.
Original README.md follows:
Contains the code of Install Chrome Extensions hosted at https://addons.opera.com which allows users to install extensions from Google Chrome Web Store directly in Opera browser.