Comment 4 for bug 1690254

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0
Build ID: 20170418122848

Steps to reproduce:

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.

Actual results:

Click-and-drag scrolls some links to other articles in from the sides, while double click resizes the article text. 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 cursor changes between a pointer, finger, and text cursor, and since clicking on links works.

This inconsistency violates the Law of Least Astonishment.

Expected results:

The user should be able to select text at will.