Release a beta of the Firefox WebExtensions port
Created by: Bisaloo
If I got it right, the webextension port is ready or close to be since you released a chromium version of decentraleyes.
I think you should release a beta before the official release of Firefox 57. HTTPS-Everywhere just did this and the firefox and chromium API are apparently different enough to cause some issues.
I believe many followers of this github repo would be happy to help you test it.