# CustomTagLedger

> Audit custom element tags, registration state, upgrade timing, shadow roots, and unresolved web component names.

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

## Overview

- **ID:** `customtagledger`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** Derenia9
- **Version:** 1.0.0
- **Last updated:** 2026-05-15
- **First published:** 2026-05-12
- **Size:** 37 KB
- **Data as of:** 2026-05-19
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/customtagledger/)
- **Website:** [https://say88.com.se/](https://say88.com.se/)

## Description

CustomTagLedger is a Firefox extension for inspecting custom elements on the active page. It builds a compact ledger of hyphenated tag names, checks whether the browser currently knows a constructor for each name, and highlights unresolved or still-upgrading components.
This is useful on pages built with web components, design-system packages, hydrated islands, or component libraries that register elements at runtime. A page can look mostly correct while some custom elements remain undefined, upgrade late, or depend on customized built-in syntax that requires careful browser support checks.

## 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/customtagledger)