The test file at https://github.com/mozilla/pdf.js/blob/master/test/pdfs/annotation-choice-widget.pdf contains listboxes, which are not rendered correctly when printed right now. These kinds of fields are made by https://github.com/mozilla/pdf.js/blob/master/src/display/annotation_layer.js#L672-L678.

/cc @calixteman 
const options = event.target.options;
      if (!event.target.multiple) {
        return options.selectedIndex === -1
          ? null
          : options[options.selectedIndex][name];
      }
      return Array.prototype.filter
        .call(options, option => option.selected)
        .map(option => option[name]);
    };
    const getItems = event => {
      const options = event.target.options;
      return Array.prototype.map.call(options, option => {
        return { displayValue: option.textContent, exportValue: option.value };
      });
    };
    if (this.enableScripting && this.hasJSActions) {
      selectElement.addEventListener("updatefromsandbox", jsEvent => {
        const actions = {
          value(event) {
            const value = event.detail.value;
            const values = new Set(Array.isArray(value) ? value : [value]);
            for (const option of selectElement.options) {
              option.selected = values.has(option.value);
            }
            storage.setValue(id, {
              value: getValue(event,  true),
            });
          },
          multipleSelection(event) {