Hi rrfl, the whole Options page was revamped in Firefox 56, with older panels being consolidated. Here's my suggestion for how to find things now: * Windows: "3-bar" menu button (or Tools menu) > Options * Mac: "3-bar" menu button (or Firefox menu) > Preferences * Linux: "3-bar" menu button (or Edit menu) > Preferences * Any system: type or paste '''about:preferences''' into the address bar and press Enter/Return to load it In the little search box at the top of the Options/Preferences page, type ''device'' and Firefox should filter to the "Certificates" section and place little tags on the buttons with matches. I suspect one of those is the one you need. Success?

See also: *https://support.mozilla.org/en-US/kb/firefox-options-preferences-and-settings