Okay so let's say this is your site. You notice that Firefox gives a warning, you find the issue, remove the malicious dependency and roll out the new version. Now what? Who do you talk to to get unblocked?
I run a site that's on blocklists. There's no coming off of them once you're there (described elsewhere in this thread: https://news.ycombinator.com/item?id=50398014). These mechanisms are useful for sites that are unmaintained, but I'd not wish it upon admins that immediately respond to vulnerability or abuse reports
I can understand that most people are not aware of this though, just a bit frustrating to see the call for nuking it altogether. It's not what you'd do if one of these 15000 sites was Onedrive: you'd realise the solution is talking to Microsoft. Only when they don't fix their infection would it make sense to take their site offline