Why not posting a proper source? https://mullvad.net/es/blog/shutting-down-our-search-proxy-leta

Shame it never gained proper momentum, but I admit I only used it sporadically myself. Hopefully, Mullvad Browser isn’t going anytime soon. Again, it’s not my main browser but I do turn to it, and more often than I did to Leta.

I was using that :(

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Happy Kagi customer.