Public bug reported:

Note: this bug *may* affect touch screen devices only. Just a hunch.

Load an NYTimes article such as
https://www.nytimes.com/2017/05/10/science/trappist-earth-size-planets-
orbits-music.html and attempt to select some text, either via click-and-
drag or double/triple click.

Using the official Mozilla Firefox 53.0.2 build, this works as expected.
Using the Ubuntu Zesty Firefox 53.0+build6 build however, the user can't
select any text. Instead, click-and-drag scrolls some links to other
articles in from the sides, while double click resizes the article text
(equivalent touchpad and touchscreen interactions have the same effect).
Android-style tap-and-hold does nothing. Caret Browsing also doesn't
work, as the arrow keys are overridden. Only <Ctrl>+<A> still works as
expected.

There doesn't seem to be an invisible layer above the text, since the
mouse pointer changes between an arrow, finger, and I-beam cursor, and
since clicking on links works.

This inconsistency violates the Law of Least Astonishment.

Affected browsers:
* Ubuntu Gnome 17.04 64-bit touchscreen: Ubuntu Firefox 53.0+build6 with clean 
profile, Ubuntu Modifications add-on only
* Ubuntu Gnome 17.04 64-bit touchscreen: Ubuntu Firefox 53.0+build6 with clean 
profile and no add-ons
* Ubuntu Gnome 17.04 64-bit touchscreen: Ubuntu Chromium 58.0.3029.96

Not affected:
* Ubuntu Gnome 17.04 64-bit touchscreen: Official Mozilla Firefox 53.0.2 with 
clean profile
* Ubuntu 16.04 LTS 32-bit: Ubuntu Firefox 53.0+build6 on Ubuntu 16.04 LTS
* Windows XP 32-bit: Mozilla 52.0.2

Bugzilla reference: https://bugzilla.mozilla.org/show_bug.cgi?id=1363936

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: firefox 53.0.2+build1-0ubuntu0.17.04.2
Uname: Linux 4.11.0-041100-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
BuildID: 20170509205512
CurrentDesktop: GNOME
Date: Fri May 12 07:47:00 2017
InstallationDate: Installed on 2016-12-02 (159 days ago)
InstallationMedia: Ubuntu-GNOME 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1690254

Title:
  Ubuntu browser builds can't select text on NYTimes articles

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