PDF export doesn't produce internal links when using Firefox

When exporting a wiki page to PDF (on the client-side) using Firefox, the internal links end up as external links. Take for instance this content:

[[section link>>||anchor="HSection"]]

= Section =

Even though the HTML produced by XWiki has an internal link:

<a href="#HSection">section link</a>

Firefox is generating an external link in the PDF, which means clicking on the link inside the PDF doesn't scroll the PDF but open the link in web browser. Chrome doesn't have this problem.