I think this is the article you referenced:

This blog post was just sent out by Freedom Scientific. If you use JAWS and
Firefox, you need to read this.

Important information for users of Mozilla Firefox

Jonathan Mosen October 25, 2017 0

Overview

On November 14, Mozilla is expected to release a new version of its Firefox
web browser. Firefox 57 represents such a significant technical and
performance change that it's going to be known as Firefox Quantum. Mozilla
and mainstream reviewers of the beta code agree, the browser is much faster
and more memory efficient.

The reason why mainstream users will see such a significant speed increase
with Firefox Quantum is that it is switching to a multiprocess methodology.
Unfortunately, Mozilla in their switch to multiprocess for Firefox has
chosen an accessibility approach in which each call for JAWS to obtain
information takes orders of magnitude more time.  We are disappointed that
Mozilla has not at this time adopted the highly performant approach that
Google took with Chrome to increase security while at the same time allowing
screen readers to access information at unparalleled speed without needing
to make any changes.

For now, we recommend switching to the Extended Support Release (ESR) of
Firefox as work on the accessibility issues continues, because even when you
are running assistive technology that supports Firefox Quantum, performance
with Firefox will be much worse than you are used to. We're working with
Mozilla to improve the situation and are hopeful of further improvement.

We appreciate that if you're a Firefox user, it's software you are likely to
use many times every day. We want by way of this post to explain the
situation as it currently stands and how we got here, plus what we're doing
about it and steps you can take so that in the short to medium term, you can
use Firefox with the same degree of responsiveness you're used to.

Short-term Work-around

For now, there is a way to avoid upgrading to Firefox Quantum while keeping
your browser updated with important security fixes. You can install Firefox
ESR (Extended Support Release). The Quantum changes are not scheduled to be
rolled out to this release until the second quarter of 2018, by which time
we hope the accessibility situation with Firefox Quantum will have improved.

Compatibility

While we cannot recommend Firefox Quantum at this time, we appreciate that
some people may be curious and want to experiment with it. Firefox Quantum
will not work in any fashion unless you are running the latest versions of
JAWS 2018, JAWS 18, ZoomText 11 and MAGic 14. Previous versions of our
assistive technology are not compatible with Firefox Quantum.

To ensure Quantum will run at all, please ensure you are running the most
current version of the above technologies. Please visit our downloads page
for the latest software.

If going current with your assistive technology isn't possible, the Firefox
ESR release discussed above will continue to work at this time with the
technology you have. This will not always be the case, so if using Firefox
is important to you, you should make plans to bring your technology
up-to-date over the next few months.

When it is installed, Firefox Quantum will be able to detect if older
assistive technology is running that is not compatible. When this is the
case, Firefox Quantum will alert you to this.

Performance

Unfortunately, even if you have an assistive technology product that has
been updated to accommodate Mozilla's new approach, you will notice a
serious deterioration in performance. We would go as far as saying that at
this point, you would not want to use Firefox Quantum for your daily
browsing. Pages will take a long time to load, and navigating pages will be
problematic.

The reason for this is that Firefox's implementation of multiprocess has
caused a marked deterioration in the speed of communication between the
browser and assistive technology.

As our users who browse with Google Chrome, which has been using
multiprocess for some time, can confirm, multiprocess browsers can provide a
highly responsive experience comparable with what Firefox users are
accustomed to, and it is still our hope that Mozilla might adopt a similar
approach.

The problem created by Firefox Quantum is a complex technical one, but we
believe all our users are entitled to an explanation, so here's our best
shot. To give you a browsing experience that is the most flexible available,
as well as being intuitive and accurate, JAWS behaves a bit like an
impatient child on a long car journey. It asks Firefox many questions on a
regular basis, including "are we there yet". In the past, Firefox had no
difficulty answering all our questions quickly and patiently, meaning we
could always give you up-to-the-second information about what was happening
on the web page. For our readers with some technical knowledge, we did this
through calls to MSAA and it wasn't necessary to ration those calls.

Because of Firefox's suboptimal implementation of multiprocess from an
accessibility perspective, it's as if the driver of the vehicle is tired.
Firefox takes much longer to answer the important questions we need to ask
it about what's happening on the page. This manifests itself in a serious
degradation of responsiveness that we fully accept is unpleasant.

Resolving the situation

We're committed to our users being able to use whatever browsing solution
works best for them. Ideally, that choice should be made based on
feature-set, rather than accessibility considerations.

To that end, we're attempting to address the performance issues with Firefox
Quantum in two respects.

First, we'll continue to work on minimising the calls we're making to
Firefox, the questions we're asking if you will, ensuring they're kept to a
bare minimum without impacting on getting you the information you need.

Second, we'll continue to reach out and work with Mozilla, encouraging them
to make refinements to their approach that will improve accessibility over
time.

Final thoughts on the future

For those with a technical interest in the future of screen reading, we
believe it is important to have discussions about how we can ensure that
we're responding to the changing, more dynamic nature of the web, while
never losing sight of giving users the great experience they've come to
expect from JAWS.

We want to acknowledge Marco Zehe's thoughtful post "Rethinking Web
Accessibility on Windows."  The approach Marco outlined is functionally what
we've already done to support Microsoft Edge, because of similar performance
issues that would be readily apparent with that browser had we tried to have
a virtual buffer. Yet in Edge, we have retained where possible the current
document-based paradigm, which works well on most pages and which provides
users with a functional, proven, familiar experience.

We may conclude that we need to make that switch for Firefox as well to get
performance back up to pre-Quantum levels, but we believe that the virtual
buffer offers an opportunity for JAWS to innovate with features like
Flexible Web that would be difficult or slow if most information gathering
and navigating is left to the browser. Flexible web is a powerful feature,
used by our customers to save time and be productive in environments that
would otherwise be less efficient. JAWS is about more than accessibility,
it's about efficiency, productivity and the user experience.

Since Chrome has proven that multiprocess, virtual buffers, and screen
reader performance can happily coexist, we see advantages to ensuring that
virtual buffers continue to operate efficiently.

We will continue to update you via this blog and FSCast regarding the status
of Firefox Quantum.

-----Original Message-----

On 10/25/2017 2:57 PM, JM Casey wrote:
> So..
>
> Has anyone Hey folks. Haven't seen any discussion about this yet. On 
> another list, someone posted an article about this, which I cannot 
> seem to find the URL for, but if people are interested I guess I could 
> cross-post it. In
> brief: Firefox Quantum has a new "multiprocessing" approach that means 
> it will be twice as fast for everyone else, but it will not play 
> nicely with JAWS or other screen-readers. We're essentially at the 
> same stage now (or will be come November) as we are with Edge, in that 
> it's going to be a work in progress for quite some time, and from what 
> I've read, it may be difficult to continue implementing the virtual 
> buffer concept. This is, to me, annoying to say the least, as I use 
> Firefox all the time and have been really happy with it up til now. I 
> also think the virutal buffer a great innovation for web browsing and 
> would hate to give it up, unless a better alternative was developed.
>
>   
>
> Has anyone thoughts on this? I used to laugh at "old people" (in 
> quotes there, in case you have punctuation set to "some" or "none") 
> who moaned about things changing too fast and that they couldn't keep 
> up. Now, at 37, I'm feeling the bite. I'm happy to no longer be using 
> Windows XP, yet it seems like every month (since getting Windows 10 
> and JAWS 18 in particular), there's some new thing I have to fix that 
> wasn't broken before; some time I have to spend figuring a workaround 
> to one thing or another, or a doomful press release about how I won't 
> be able to use this-or-that once a certain update happens.
>
>   
>
> Fortunately, for us Firefox users, I guess we can still install the 
> ESR (Extended Support Release) of the browser, and get security 
> updates, without a Quantum upgrade, until sometime in 2018. Guess I'll be
doing that, then!
>


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