1. Start Firefox
2. Try to download something. (I usually right-click an image, and then use "save image as". But any download operation that starts the file picker will do.)
3. Highlight the name of the file to be saved.
4. Start typing over the file name
5. The focus will change to the "search" box on the file picker, and all additional keystrokes will go there.
The only way to change the file name is to
a. type one character in the file name box
b. mouse-click in the file name box
c. type the next character in the file name box
(repeat until file name is complete or your have gone insane :)
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: MATE
DistroRelease: Ubuntu 22.04
InstallationDate: Installed on 2018-08-04 (1464 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
NonfreeKernelModules: nvidia_modeset nvidia
Package: marco
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.15.0-43.46-generic 5.15.39
Snap: firefox 103.0.1-1 (latest/stable)
Snap.Changes: no changes found
Tags: jammy
Uname: Linux 5.15.0-43-generic x86_64
UpgradeStatus: Upgraded to jammy on 2022-05-21 (77 days ago)
UserGroups: adm bumblebee cdrom dip docker lpadmin plugdev sambashare sudo
_MarkForUpload: True
Oh, I've tried FF with Plasma and with the "Ubuntu" environment, and it works fine with those.