Is CrossBrowserTesting Local Connection safe?
Most notable: access data on all websites, access data on all websites.
This extension has not been updated in 90 months. Unmaintained extensions keep whatever permissions they were granted, and security fixes stop arriving.
What it can access (17 permissions)
Read from the extension’s own manifest. These describe what it is technically able to do — not what it does do.
- Access data on all websitescritical
Read and change the content of every site you visit, including banking and email.
- Access data on all websitescritical
Read and change the content of every site you visit, including banking and email.
- app.windowlow
No documented elevated capability.
- browserlow
No documented elevated capability.
- webviewlow
No documented elevated capability.
- Local storagelow
Store its own settings and data locally.
- Notificationslow
Show desktop notifications.
- {'fileSystem': ['write', 'directory', 'retainEntries']}low
No documented elevated capability.
- Access http:low
Read and change content on http: only.
- Access https:low
Read and change content on https: only.
- Access http:low
Read and change content on http: only.
- Access https:low
Read and change content on https: only.
- Access http:low
Read and change content on http: only.
- Access https:low
Read and change content on https: only.
- Access http:low
Read and change content on http: only.
- Access https:low
Read and change content on https: only.
- Access *.crossbrowsertesting.comlow
Read and change content on *.crossbrowsertesting.com only.
Alternatives
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Claim this extensionData read from the Chrome Web Store listing on 2026-09-16. Install counts are the store’s own rounded buckets. Permission descriptions are derived from the extension’s published manifest. This page describes capabilities, and is not an accusation of misuse.