Ah ... I just updated and now I have 52. And no e10s, same as you. Have you checked Red Hat Bugzilla? It may be a bug already filed. Meanwhile, I don't see anything suspicious in about:config when I search for 'e10s'.

On Thu, Mar 9, 2017 at 3:01 PM Bojan Smojver <bojan@rexursive.com> wrote:
> Are you using Fedora's Firefox or straight from Mozilla?

Fedora:

https://bodhi.fedoraproject.org/updates/FEDORA-2017-bb459964ce

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Bojan
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