I was again posting in haste and I'm very sorry my post led to such an offensive and insulting generalisation about the French.
Journalists at Libé resigned not because of who Rothschild was but because the presence of a private investor of any sort went against everything Libération had stood for at the start. It was set up after May 1968 as non-hierarchical, without any paid ads, and was funded solely by subscriptions and sales, usually at news kiosks. It is neither left nor right-wing and is usually on pretty poor terms with all major parties.
Rothschild got about 35%, IIRC, and the simple fact that a private investor, not him in particular, had bought a stake in the paper, put off a lot of left-wing readers. The resignations were provoked in part by his announcement that he would pull out unless the editor, Dreyfus, went, - it was felt that he was interfering in what had hitherto been a determinedly open and free paper, where writing mattered more than political affiliation and that his main aim was to sell papers and get rich, rather than provide quality journalism, which LIbération has always been known for.
A quick look at some of the (prize-winning) journalists working/who worked at the paper, and at the articles it publishes, shows that the idea anyone resigned because Rothschild "might as well be foreign" is just plain wrong.
Anyway, back to Brexit for some much needed peace and harmony...