So far I have been using Katalon for Mozilla Firefox and everything worked fine, but today when creating (previously recorded pages) I get the error [error] c.initKeyEvent is not a function

Welcome to Katalon Community, please kindly share your log or screenshot so we can assist you with your issue.

The error [error] c.initKeyEvent is not a function typically indicates a JavaScript compatibility issue. The initKeyEvent() method is a deprecated DOM API that was removed from modern Firefox versions. This method was replaced by the KeyboardEvent constructor in modern browsers. This error commonly…

hi @es600jarek it’s seems like compatibility version issue. maybe you can try to: update geckodriver: in Katalon Studio: Tools → Update WebDrivers → Firefox, then restart and retry update Katalon Studio: newer builds often fix Firefox/geckodriver compatibility issues if custom JS is involved,…

Did you check any of the suggested solutions?

kindly update both katalon and webdrivers to latest version and confirm if issue still persists?

I am getting the same issue when using the Katalon Recorder 5.5.3. This happens only at the login screen I am testing. It started failing on Firefox with the latest update, 147.0.1. I don’t use the Studio version, just the browser addon and have used it for many years running similar tests at my job…

I am using the same versions of both software programs and having the same issue. Did you figure it out? I’ve tried updating everything as stated above and it still doesn’t work. I’m wondering whether I need to go back a version of Firefox.

Install Katalon Web Recorder Plus now tried this? [image] Introducing Katalon Web Recorder Plus – A Smarter, Faster Way to Capture Web Tests Web Testing If you’ve used Katalon Recorder in the past, we’ve got great news: Katalon Web Recorder Plus is here — …

Hi @es600jarek , @jimmygarcia and @kristi1 , Can you all please share the product, version you are using? As @jimmygarcia mentioned he is using Katalon Recorder, just to let you know that KR is now under very low maintenance effort that might come up with many potential issues. We would like to en…

[error] c.initKeyEvent is not a function

Web Testing

dineshh January 25, 2026, 10:54am 10

Install Katalon Web Recorder Plus now tried this?

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[error] c.initKeyEvent is not a function

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