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Tobin stormed off 6 months ago, and tried to nuke the project on the way out the door, so now there's one main dev and a few contributors. They never had the resources or expertise needed to maintain a competitive and secure browser, and an army of skilled volunteers failed to appear to help, so they filled all the gaps with FUD (" HTTP/3 is bad", " Rust isn't strongly-typed", "WebAssembly can run arbitrary code", etc.) and trudged on for 5 years. They hated Mozilla's decision to remove XUL and thought they could build a better browser on their own.
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Pale Moon uses a hard fork of Firefox 56 because of the egos of its two main dev's (known as Moonchild and Tobin). Nobody should be recommending Pale Moon without providing a full disclosure of the significant risks that come with it.
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