Extension host unresponsive on Linux Mint 22 - kiro.kiroAgent freezes at startup, browser auth never opens

[Fernandel001]

Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

Linux 6.17.0-22-generic - Linux Mint 22.3

Expected behaviour

Clicking "Sign in" should open the default browser (Firefox) to complete authentication, then return to Kiro IDE logged in.

Actual behaviour

The extension host (kiro.kiroAgent) becomes unresponsive ~6 seconds after startup, before any user interaction. The "We will take you to your browser" screen appears but no browser opens. Kiro freezes completely and requires force shutdown. Running with --disable-gpu reduces severity but does not fix the issue.

Steps to reproduce

1. Install Kiro IDE 0.11.133 on Linux Mint 22.3 (Zena) via .deb package
2. Launch Kiro from terminal: kiro
3. The sign-in screen appears
4. Click any sign-in button (GitHub, Google, etc.)
5. Screen shows "We will take you to your browser" but nothing happens
6. Extension host becomes unresponsive after ~6 seconds (visible in logs)

Note: xdg-open works correctly. kiro-cli is authenticated. IPv6 is unavailable on this network but IPv4 works fine.

Environment

<This will be visible to anyone. Do not include personal or sensitive information>

[q-details]
version = "2.1.1"
hash = "1d2ba18834ea4e6a88312b0dc70b2014b703aa6e"
date = "2026-04-25T00:26:23.098938Z (24h ago)"
variant = "full"

[system-info]
chip = "Intel(R) Celeron(R) N4020 CPU @ 1.10GHz"
total-cores = 2
memory = "3.64 GB"

[system-info.os.linux]
kernel_version = "6.17.0-22-generic"
id = "linuxmint"
name = "Linux Mint"
pretty_name = "Linux Mint 22.3"
version_id = "22.3"
version = "22.3 (Zena)"

[environment]
cwd = "/home/USER"
cli-path = "/home/USER"
os = "Linux"
shell-path = "/usr/bin/bash"
shell-version = "5.2.21"
terminal = "Xfce Terminal"
install-method = "unknown"

[env-vars]
DISPLAY = ":0.0"
PATH = "/home/USER/.nvm/versions/node/v24.14.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin"
SHELL = "/bin/bash"
TERM = "xterm-256color"
XDG_CURRENT_DESKTOP = "XFCE"
XDG_SESSION_DESKTOP = "xfce"
XDG_SESSION_TYPE = "x11"