Attach (recommended) or Link to PDF file here:
[multiple.pdf](https://github.com/mozilla/pdf.js/files/6344777/multiple.pdf)

Steps to reproduce the problem:
1. Write something in a field

What is the expected behavior? (add screenshot)
The 3 fields must have the same value

What went wrong? (add screenshot)
The 2 other fields are empty

The three fields share the same name `Text3`.
It works as expected in Adobe and Chrome.
modificationDate.dataset.l10nArgs = JSON.stringify({
        date: dateObject.toLocaleDateString(),
        time: dateObject.toLocaleTimeString(),
      });
      popup.appendChild(modificationDate);
    }
    const contents = this._formatContents(this.contents);
    popup.appendChild(contents);
    if (!Array.isArray(this.trigger)) {
      this.trigger = [this.trigger];
    }
    
    this.trigger.forEach(element => {
      element.addEventListener("click", this._toggle.bind(this));
      element.addEventListener("mouseover", this._show.bind(this, false));
      element.addEventListener("mouseout", this._hide.bind(this, false));
    });
    popup.addEventListener("click", this._hide.bind(this, true));
    wrapper.appendChild(popup);
    return wrapper;
  }
  /**
   * Format the contents of the popup by adding newlines where necessary.
   *
   * @private
   * @param {string} contents
   * @memberof PopupElement
   * @returns {HTMLParagraphElement}
   */
  _formatContents(contents) {