Although the permissions and preferences may still exist, AFAIK the only
way to whitelist a domain for use with Remote XUL is via Jorge's Remote XUL
Manager add-on.

Jorge, do you plan to port this to WebExtensions (if that's even possible)?
Or is there another way to edit the whitelist? If not, that would
effectively stop Remote XUL applications working with new installations of
Firefox >56, regardless of other changes.

We've told users of our Remote XUL applications that, in practice, we will
only support up to Firefox 52ESR (and even this has issues if e10s is
enabled), while we're frantically rewriting our code to HTML in the hopes
of having it ready before the 52ESR EOL.

Mark


> As far as I know, the permissions and preference that enable remote XUL
> will still exist. However, there are big changes happening all over the
> platform that could break XUL applications. So, while I think it will
> still be possible to load remote XUL applications, there's no guarantee
> they will work.
>
> Jorge
>
> On 10/19/17 11:47 AM, Zachary Kung wrote:
> > Hi All,
> >
> > I have been getting a little confused about the scope of the changes to
> > Firefox 57. I have read some articles saying that XUL as a whole is
> > dying and some that say it's just XUL plugins. Can someone clarify if
> > I'll be able to use remote XUL in 59 ESR?
> >
> > Zach
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