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If you want to use Firefox with a https connection on a local server, you’ll have to generate a ssl root certifcate and a ssl certificate signed by the root certificate for the local server . Since your root certificate is not included by default in the certificate authorities trusted by Firefox, you’ll get a warning each time you connect to the local server.
To avoid this warning, you can add the root certificate to the Firefox trusted authorities. Go to Preferences > Privacy & Security and click on the Certificates button to open a popup with the list of certificates trusted by Firefox.
In the Authorities tab of the modal, click the Import button and choose your root certificate file (e.g. rootCA.pem) in your file explorer.
Do not forget to select the tickbox Trust this CA to identify websites.
Your root certificate is now used by Firefox to check website ssl certificates. You should be able to connect to your local server through https without seeing the security warning.
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