1675833 - Firefox Developer Edition doesn't recognize Control, Alt and Shift keyboard events

Status: UNCONFIRMED

(Core :: DOM: Security, defect, P3)

Description

[Manuel]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

Important notes: This works in other browsers and other editions of firefox, it seems like just the developer edition is affected. Tested in Version 83.0b9 (64-bit)

1. I've entered the following code snipped into the developer tools console to log the keystrokes to the console:
   onkeydown = e => console.log(e.key);
2. Now all keys I press get logged into the console

Actual results:

All keys I pressed got logged except for the Control, Shift and Alt key.

Expected results:

All keys should have been logged, including the Control, Shift and Alt key.

Comment 1

[Manuel]

Here is a screenshot of the keyboard events of Firefox Developer Edition in Save Mode to make sure all Addons are disabled and Settings are reset (right) compared to a fresh installation of the new Microsoft Edge (left) on the website https://www.jeffersonscher.com/res/keyvents.html

Comparison: https://imgur.com/a/NtIX3Bt

Comment 2

[Kestrel]

I only see this with privacy.resistFingerprinting enabled, can you please confirm you have this enabled and that it works as expected when disabled?

Comment 3

[Manuel]

Yes, that was it, thank you! I remember setting this after reading about it on https://www.privacytools.io/browsers/#about_config But should that be a feature? While I can imagine that it might be useful to prevent websites from tracking your keyboard input, this might break some things too (for example, in my case I couldn't use Shift to sprint in a browser game).