Parcel bundler's self-signed certificates include some configuration which is appears incompatible with Firefox, which throws the certificate error with code MOZILLA_PKIX_ERROR_CA_CERT_USED_AS_END_ENTITY.
The error is explained at the bottom of this page.
Parcel includes this feature in certificate generation, which causes the error.
This repo is a copy of the parcel generation script, with that feature omitted, to enable working certificate generation for Firefox.
$ git clone git@github.com:shanehandley/parcel-cert-gen-firefox.git
$ cd parcel-cert-gen-firefox
$ npm install
$ node ./index.js
The certificate files will be dumped in the CWD. You can then:
- Back up the certificate: It helps if you clear your
.cachedirectory, as you can drop it back in and ignore parcels generated certificate. - Install and trust it locally
- Copy the cert your parcel project
.cachedirectory - Restart your parcal server, if required
- Visit https://127.0.0.1:1234 to test.
- You may need to restart Firefox.