https://www.justice.gov/epstein/files/DataSet 9/EFTA01249734.pdf
This link drove me nuts last night, until I stopped tapping the link in Jerboa and instead copy/pasted the link directly into Fennec web browser.
If this bug has been resolved in a newer version of Jerboa, well just let me know and I’ll make a point to update later.


Well, this certainly sounds like an issue with how your phone handles links to PDFs and not Jerboa itself.
In the Default Apps settings is a sub menu called Opening Links which lists apps which are able and/or allowed to open specific types of links. See if there is an entry for WPS Office and check for something like
*.pdf. Next check if there is a setting in Fennec for how to handle PDFs.Been there, tried that. No dice, WPS Office isn’t set to default open anything.
Jerboa is apparently forcing that itself.