I beg to differ, to me they lost the tab identity. I'm no purist but I'm really tired of the reinvention of wheels here. Latest firefox ui efforts (beside the download progress icon which was great) were a negative on me from day one. Sorry. Mozilla, save your energy for other things .. I don't think you're losing users due to the shape of tabs.

- some people are doing tab summary in their browser (nlp)

- tab grouping is re-explored in chrome, it was nice in past firefox, it's not a useless idea but could be revisited

- archiving helper (no more 404 maybe ?, partner with wayback machine maybe ? or archive.is)

- history view