MarsSeed [1] filed a request to merge caja-pdf-tools [2] into nautilus-pdf-tools-git [3]:
No stable releases since 2019. 'nautilus-pdf-tools-git' has a subpackage for the Caja extension. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/caja-pdf-tools/ [3] https://aur.archlinux.org/pkgbase/nautilus-pdf-tools-git/
