1432859 - Control key functions don't work on Google Docs or Facebook when privacy.resistFingerprinting = true

Status: RESOLVED DUPLICATE of bug 1433592

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[firefox]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180122144257

Steps to reproduce:

On Firefox (Nightly) 60.0a, I visited Google Docs and Facebook with privacy.resistFingerprinting manually set to true, and tried to use control keys on a document (on Google Docs) or a status update text box (on Facebook).


Actual results:

The website did not properly handle the select all (Ctrl + A), copy (Ctrl + C) and paste (Ctrl + V) control keys. It instead just typed whatever the letter after Ctrl was - so pressing Ctrl + A would result in the letter A being typed. On Facebook, the same behaviour occurred when typing a status update, but in addition when typing Ctrl + A the text present in the text box before pressing the key combination is highlighted.

I wrote some more details about this here: https://support.mozilla.org/en-US/questions/1201297

The issue went away when I set privacy.resistFingerprinting back to default (false).


Expected results:

Correct control functionality, i.e. select all, copy, paste, etc.

Comment 1

[Peter Gerber (:pege)]

I noticed this too, in my case on Github. The issue seems to be that ctrl + c fires a event for the c key (lacking the ctrl modifier key). I guess all ctrl + KEY combination stop working when KEY itself fires an event.


I used https://arthuredelstein.github.io/tordemos/keyboard.html to compare Tor Current implementation with Nightly's reimplementation. (The page linked is broken on Nightly for some reason, just copy the JS of the page into the console manually.)


In Nightly:

event = keydown
key = c
charCode = 0
which = 67
code = KeyC
keyCode = 67
location = 0
altKey = false
ctrlKey = false
metaKey = false
shiftKey = false
ModifierState: 

event = keypress
key = c
charCode = 99
which = 99
code = KeyC
keyCode = 0
location = 0
altKey = false
ctrlKey = false
metaKey = false
shiftKey = false
ModifierState: 

event = keyup
key = c
charCode = 0
which = 67
code = KeyC
keyCode = 67
location = 0
altKey = false
ctrlKey = false
metaKey = false
shiftKey = false
ModifierState: 


In Tor Browser:


event = keydown
key = c
charCode = 0
which = 67
code = KeyC
keyCode = 67
location = 0
altKey = false
ctrlKey = true
metaKey = false
shiftKey = false
ModifierState: Control

event = keypress
key = c
charCode = 99
which = 99
code = KeyC
keyCode = 0
location = 0
altKey = false
ctrlKey = true
metaKey = false
shiftKey = false
ModifierState: Control

event = keyup
key = Control
charCode = 0
which = 17
code = ControlLeft
keyCode = 17
location = 1
altKey = false
ctrlKey = false
metaKey = false
shiftKey = false
ModifierState:

Comment 2

[Peter Gerber (:pege)]

For reference, Bug 1404608 appears to be what introduced the feature in FF 60.