I like the idea of the extension, but the implementation in lacking. According to the project's gitlab[1], there's only a dozen or so libraries are actually being served. It doesn't seem to cache google web fonts, for instance. Some sibling comments mentioned LocalCDN, which has more libraries and also includes fontawesome, but still lacks google fonts.
[1] https://git.synz.io/Synzvato/decentraleyes/-/tree/master/res...