https://help.libreoffice.org/Common/Applying_Digital_Signatures#Managing_your_Certificates The instructions here seem to be out of date, as the menu items have changed, etc. For me, to navigate to the cert import dialog uses the following path: Preferences -> Advanced -> Certificates -> View Certificates We should review the whole page to make sure it's up to date with the latest Firefox.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.