[🐛 Bug]: Selenium tests are failing on FireFox 147 (released 13 Jan)

[remi-fusio]

Description

Selenium is trying to insert text into a input field
I'm getting the error "initKeyEvent is not a function".

The "type" command, I believe, is reproducing a keyboard entry, which I presume calls initKeyEvent(). This function might be blocked or deprecated in FF 147

Reproducible Code

{
      "id": "22a8658b-5103-42ce-b00c-a5437ec0484d",
      "comment": "",
      "command": "type",
      "target": "id=lastname",
      "targets": [],
      "value": "Lorem ipsum testing issue"
    }

Debugging Logs

type on id=complainant1-lastname with value Lorem ipsum testing issue Failed:
n.createEvent(...).initKeyEvent is not a function

---

ℹ️ Last known working version: Previous version of Firefox before 13 January 2026

[github-actions]

⚠️ You reported using Selenium version 3.17.4, but the latest release is 4.39.

Please verify that this issue still occurs with the latest version. If it no longer applies, you can close this issue or update your comment.

This issue will be marked "awaiting answer" and may be closed automatically if no response is received.

[selenium-ci]

@remi-fusio, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide

[AutomatedTester]

@remi-fusio just for clarification, are you using the latest geckodriver or are you using selenium manager to manage this for you?

[remi-fusio]

I'm using the latest version of the plugin and the latest version of FF. I'm not sure it does answer your question.

[titusfortner]

Selenium hasn't changed, and it should be doing the correct thing. It's likely a geckodriver/firefox issue, but we would need code we could execute that shows the problem, or logging enabled: https://www.selenium.dev/documentation/webdriver/browsers/firefox/#log-output