dequelabs / dequelabs/axe-core

axe DevTools induces a JS crash on any webpage relying on rollbar.js (error monitoring JS library)

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#4,975 10 comments 0 reactions 0 assignees View on GitHub
core critical extension fix
Dominant language
JavaScript
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Description

### Product

axe Extension

### Product Version

axe DevTools 4.117.1 (based on axe-core 4.10.3) on Firefox 146.0.1

### Latest Version

- [x] I have tested the issue with the latest version of the product

### Issue Description

#### Expectation
With axe DevTools enabled, I should be able to visit any webpage without inducing a page-wide Javascript crash.

#### Actual
When the visited webpage relies on the [rollbar.js library](https://github.com/rollbar/rollbar.js) ([Rollbar](https://rollbar.com/) seems to be a SaaS error monitoring platform), a crash occurs systematically when visiting with axe DevTools enabled: `Error: Permission denied to access property "_rollbarOldOnError"`
See the linked issuue on the rollbar.js repository: rollbar/rollbar.js#839

#### How to Reproduce
As of December 30, 2025, affected webpages include [wise.com](https://wise.com/) and [the gog.com storefront](https://www.gog.com/). On gog.com, the crash prevents the login form from opening correctly.
Disabling the axe DevTools extension immediately stops the issue.

Contributor guide

Open the contributing guide

Assessment

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