The popular ca extract service on the curl web site converts the Firefox ca certs into a PEM file suitable for use with curl, wget or anything else OpenSSL-based that likes PEM formatted CA cert bundles.
The main script was fixed yesterday as it was previously getting a nightly source code snapshot to get the “magic” file to convert from, but I noticed they stopped updating the nightly source snapshots a good while ago so the updates had stopped!
Now, the script only gets the actually needed certdata file and converts it, so now it downloads a lot less data in vain and it also thus runs much faster. Now the PEM files offered on that page are up-to-date with the most recent Firefox.