Yes, the discoverability is definitely a problem, though I think that might be on purpose and that Mozilla might be planning to do something user-facing with th

Yes, the discoverability is definitely a problem, though I think that might be on purpose and that Mozilla might be planning to do something user-facing with the feature. But I disagree it's that hard for users to eventually understand and accept, if presented right. Tabs were also a niche feature once.