[tbb-dev] Fwd: Landing in 66: force opt-in to run extensions in private browsing

Georg Koppen gk at torproject.org
Tue Dec 18 16:07:00 UTC 2018

Tom Ritter:
> I don't think this will be concerning for Tor Browser; aside from
> needing to set the appropriate bits for the bundled extensions.

Yeah, I saw that. https://trac.torproject.org/projects/tor/ticket/28896
tracks related work.


> -tom
> ---------- Forwarded message ---------
> From: Shane Caraveo <scaraveo at mozilla.com>
> Date: Tue, Dec 18, 2018 at 3:39 PM
> Subject: Landing in 66: force opt-in to run extensions in private browsing
> To: <firefox-dev at mozilla.org>, <dev-platform at lists.mozilla.org>
> This is an FYI so you don't get surprised in the near future.
> The extensions API includes support for an "incognito" entry in the
> extension manifest where an extension may opt-out of running in private
> browsing windows.  Chrome has since made that the default, and requires
> an opt-in by the user to run an extension in private browsing.  We're
> playing a bit of followup on this, since we bypassed the feature during
> the crazy ramp-up for webextensions.
> The intention is to land this for 66, and a large chunk of it landed the
> other day.  Extensions currently cannot make use of what has landed
> (though tests can and do).  Extensions will continue to work as they
> previously did until we pref the feature on.
> The next part to land will be additional UI in about:addons[1] that
> allows the user to enable an extension for private browsing.  A pref
> (off for now) will be introduced to enable this.  At that point, you
> will be able to play with it, however there is more work to be done at
> the webextension API level.  The pref will not be turned on until all
> necessary API modifications are completed.
> Assuming that everything goes according to plan, you will see this
> pref'd on during the 66 nightly cycle.  At that point, all of your
> extensions, excluding system extensions, will stop working in private
> browsing until you enable those you want to work there.
> If you are curious you can look through the meta bug[2].  If you have
> questions, please feel free to reach out to me, mixedpuppy, on
> #webextensions irc channel or #add-ons on slack.
> [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1511636
> [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1380809
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