- checksums: https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/late...
- signatures: https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/late...
- signing key: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/lat...
edit: reformatting
2nd edit: added https
Also, the sources aren't the same, the binary is downloaded from a mirror / CDN while the links I posted are from the main FTP server.
edit: grammar corrections
- checksums: https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/late...
- signatures: https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/late...
- signing key: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/lat...
edit: reformatting
2nd edit: added https