Non-e10s is such a different environment that I don't think we have any
hope of keeping it working without running the full test suite in that mode
and I don't think anyone wants to do that. Now that this has started
breaking I think it is actively harmful to our users for us to allow them
to disable e10s.

On Wed, Jun 10, 2020 at 11:30 AM Gijs Kruitbosch <gijskruitbo...@gmail.com>
wrote:

> (Copied to fx-dev; Replies to dev-platform please.)
>
> Hello,
>
> Just over a year ago, I started a discussion[0] about our support for
> disabling e10s. The outcome of that was that we removed support for
> disabling e10s with a pref on Desktop Firefox with version 68, except
> for use from automation. We kept support for using the environment
> variable. [1]
>
> Last week, we released Firefox 77, which turned out to break all
> webpages sent using compression (like gzip) if you had disabled e10s
> using this environment variable. [2]
>
> So here we are again. I'd like to propose we also stop honouring the
> environment variable unless we're running tests in automation. We
> clearly do not have sufficient test coverage to guarantee basic things
> like "the browser works", it lacks security sandboxing, and a number of
> other projects require it (fission, gpu process, socket process, ...),
> so I think it's time to stop supporting this configuration at all.
>
> I hope to make this change for the 79 cycle. I'm open to arguments
> either way about what to do for 78 esr (assuming the patch for 79 turns
> out to be simple; the work to remove the pref had a number of annoying
> corner-cases at the time).
>
> Please speak up if you think that this plan needs adjusting.
>
> ~ Gijs
>
>
> [0]
>
> https://groups.google.com/d/msg/mozilla.dev.platform/cJMzxi7_PmI/Pi1IOg_wCQAJ
> [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1548941
> [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1638652
> _______________________________________________
> firefox-dev mailing list
> firefox-...@mozilla.org
> https://mail.mozilla.org/listinfo/firefox-dev
>
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