In order to change your Firefox Configuration please do the following steps : # In the [[Location bar autocomplete|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear. # Click '''I'll be careful, I promise!''' to continue to the about:config page.

Note that the DHE cipher suites were disabled for a reason and re-enabling them will make you vulnerable for the Logjam attack. You can consider to use a separate profile with the two involved cipher suites enabled and use that profile for accessing the blocked sites. See: *https://developer.mozilla.org/Mozilla/Multiple_Firefox_Profiles *http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows *http://kb.mozillazine.org/Shortcut_to_a_specific_profile You can add -no-remote to the command line to open another Firefox instance with its own profile and run multiple Firefox instances simultaneously. *http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile See also: *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox ----- Logjam: How Diffie-Hellman Fails in Practice: *https://weakdh.org/