# BaseHrefSentinel

> Audit base href and base target declarations for URL resolution risks.

Canonical page: [https://chrome-stats.com/d/basehrefsentinel](https://chrome-stats.com/d/basehrefsentinel)

## Overview

- **ID:** `basehrefsentinel`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** littleto
- **Version:** 1.0.0
- **Last updated:** 2026-05-15
- **First published:** 2026-05-12
- **Size:** 26 KB
- **Data as of:** 2026-05-19
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/basehrefsentinel/)

## Description

BaseHrefSentinel audits <code>&lt;base&gt;</code> declarations in the active tab.
It reports duplicate base elements, off-origin base URLs, unsafe base targets, and links that may be unexpectedly rewritten by a base URL.

## Permissions and access

### Permissions

- `activeTab`
- `scripting`
- `clipboardWrite`

## Safety

- **Risk impact:** Low risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows reading and modifying clipboard content, which can be sensitive, posing a moderate privacy risk.
- This extension is not longer available in the store

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Source: [Chrome-Stats](https://chrome-stats.com/d/basehrefsentinel)