TAM uses parseJSON over a div's text. The div is, for example, `<div class="opts" style="display:none">{"minExpandLevel":2,"extensions":["persist"],"icons":"false"}</div>`. This means that for icons, the value is parsed as string. However, fancyTree is strict in type checking and compares this to `!== !1` which is to say strictly to the value `false` which fails on `"false"`. So basically whatever is put there has no effect