Open the eBlocker HTTPS configuration page.
Click on the button "DOWNLOAD CERTIFICATE".
Make sure that the first checkbox "Trust this CA to identify websites" is selected (see image below).
Click on OK to insert the eBlocker certificate in Firefox or Cliqz.
You can see the eBlocker controlbar now on HTTPS sites with the Firefox, Cliqz, or Seamonkey browser.
Important: These instructions also apply to the Android Firefox browser, but not for the iOS Firefox browser.