This is the official repository (https://github.com/wingman-jr-addon/wingman_jr) for the Wingman Jr. Firefox addon, which filters NSFW images in the browser fully client-side: https://addons.mozilla.org/en-US/firefox/addon/wingman-jr-filter/ Optional DNS-blocking using Cloudflare's 1.1.1.1 for families! Also, check out the blog!
3.9.0 seems promising, clocking in at about 60-65 ms with the WebGL backend. I would have tried 3.10.0 but the CDN link is broken, see https://github.com/tensorflow/tfjs/issues/5766 .