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True Key with the private browsing feature in Firefox is not compatible. More technically, private mode won't let us persist data, which is required for some of our key operations (like logging in). Mozilla is aware and may fix it in the future but it is completely out of our control.
Regarding your second point, of splitting the screen for True Key on an iPad device, it is definitely a “nice to have” feature and I will bring it up to the development team.
Thanks for the suggestion,