Firefox does not support AEAD DHE by reason. Requiring 2048 bit DHE could prevent connections to ancient devices. It's "better" to use 2048 bit plain RSA instead of using 1024 bit DHE or being unable to connect. Chrome, Android, Googlebot, Edge, Safari and Servo do not support DHE anymore.
Bug 1496639 Comment 8 Edit History
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Firefox does not support AEAD DHE by reason. Requiring 2048 bit DHE could prevent connections to ancient devices. It's "better" to use 2048 bit plain RSA instead of using 1024 bit DHE or being unable to connect. Chrome, Android, Googlebot, Edge, Safari and Servo do not support DHE anymore. Telemetry: [Ciphersuites 21 and 23](https://searchfox.org/mozilla-central/rev/2fd8ffcf087bc59a8e5c962965bbb7bf230bcd28/security/manager/ssl/nsNSSCallbacks.cpp#931,937) on [SSL_CIPHER_SUITE_FULL](https://telemetry.mozilla.org/new-pipeline/dist.html#!cumulative=0&end_date=2020-03-04&include_spill=0&keys=__none__!__none__!__none__&max_channel_version=beta%252F74&measure=SSL_CIPHER_SUITE_FULL&min_channel_version=beta%252F60&processType=*&product=Firefox&sanitize=1&sort_by_value=0&sort_keys=submissions&start_date=2020-02-10&table=0&trim=1&use_submission_date=0).