Since this extension is used by less than 20 users at this time, I put the extension through codex to check for security issues. In addition to this security check, the adblocker works. Note that I didn't manually review the code because I'm lazy, so... obligatory 'proceed at your own risk'. This is codex-5.6-sol (high)'s response:

I found no evidence that this extension is malicious, tracks users, steals credentials, or exfiltrates data. There are no critical/high-severity issues, but one meaningful integrity weakness exists.

[I redacted a bunch of jargon the regular user wouldn't care about]

- No telemetry, analytics, external reporting, or extension-originated network requests.
- No eval, dynamic code loading, remote scripts, or HTML injection.
- No bundled third-party dependencies.
- Only the storage extension permission is requested.
- No exposed API keys, passwords, tokens, or private keys.
- The donation addresses are public payment addresses, not secrets.
- Every packaged file matches its signed SHA-256 digest, and the Mozilla PKCS#7 signature verifies successfully.

This was a static review of the supplied directory. It is not a Git working tree, so there was no commit history available to inspect.