Hi all,

The FastBlock feature is turned on by default in Nightly now (enabled by bug
1480443 <https://bugzilla.mozilla.org/show_bug.cgi?id=1480443> since
2018-09-01).

We will conduct a FastBlock Shield Study
<https://github.com/mozilla/FastBlockShield> [1] in Firefox Beta 63 to test
the feature and help us figure out the best approach to deploy it. In the
meantime, we enabled FastBlock by default in Nightly to collect early
feedback.

*What is FastBlock?*

It is a new and experimental feature aimed at improving page load
performance by restricting the loading of slow trackers. It was announced
in the recent Mozilla blog “Changing Our Approach to Anti-tracking
<https://blog.mozilla.org/futurereleases/2018/08/30/changing-our-approach-to-anti-tracking/>
[2]."

*How Can You Help Us?*

Report issues and breakage bugs if you suspect they are caused by
FastBlock. Please set the bugs as blocking the FastBlock meta bug 1472540
<https://bugzilla.mozilla.org/show_bug.cgi?id=1472540> so we’ll notice them.

You can also report issues to the #anti-tracking or #privacy channel on
Slack.

*Turning If Off*

You can toggle FastBlock by using the preferences UI (Slow-Loading
Trackers). You can also disable FastBlock by directly setting the pref
“browser.fastblock.enabled” as false.



[1] https://github.com/mozilla/FastBlockShield

[2]
https://blog.mozilla.org/futurereleases/2018/08/30/changing-our-approach-to-anti-tracking/,
Section: "Improving page load performance"

--
Ethan Tseng
Engineering Manager, Mozilla
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