dreieck [1] filed a deletion request for sielo-navigateur [2]:

According to https://github.com/SieloBrowser/sielo- legacy/issues/91#issuecomment-526569674, the package has been replaced by `sielo-browser`. It does not seem that the maintaiiner will still maintain it.

[1] https://aur.archlinux.org/account/dreieck/ [2] https://aur.archlinux.org/pkgbase/sielo-navigateur/