I failed to figure out how to enable Breeze on my Ubuntu 19.10, but I think I probably know the reason. Could you try this try build and see if it fixes the issue for you? https://treeherder.mozilla.org/#/jobs?repo=try&revision=b7ae33a618ebd2a0fcbd9f58ae258e465668ee58
Bug 1575914 Comment 19 Edit History
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I failed to figure out how to enable Breeze on my Ubuntu 19.10, but I think I probably know the reason of this issue. Could you try this try build and see if it fixes the issue for you? https://treeherder.mozilla.org/#/jobs?repo=try&revision=b7ae33a618ebd2a0fcbd9f58ae258e465668ee58