Hello, I would like to use the Dark Reader Extension with GNU IceCat, but when I download the source code from its public project repository and follow the "Building for use" directions in README.md, then try to install the build artifact "build-firefox.xpi" from the about:addons page, IceCat prints an error "mozapps IceCat has prevented this site from installing an unverified add-on."
The project appears to be licensed under the "MIT License" or "Expat License".