A1 HTML Checker

Name: A1 HTML Checker
Author: A1 Local Extensions

By: A1 Local Extensions

Run a fast local markup structure check on the active page with selectors and snippets.

Download

Install

Features & Capabilities

A1 HTML Checker helps developers, SEOs, and site owners spot common rendered-DOM structure issues without sending page content to a remote validator. Click the extension, run a check, and review findings with selectors and snippets where feasible. It checks duplicate IDs, empty href and src values, missing html lang and title, missing image alt text, heading jumps, form labels, and common invalid nesting heuristics.

User Growth & Download Statistics

Add-on

By:

A1 Local Extensions

Daily users:

Version:

0.1.0 Last updated: 2026-05-27

Version code:

6275564

Creation date:

2026-05-24

Risk:

Permissions:

Size:

30.90KB

Email:

ex*****@a1local.com.au

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-21

Compare stats and ranking:

Ranking

# 136,910 ▲ 2,589

Other rankings

#237 in html keyword 41 ▼ 7

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

A1 Local Extensions

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/a1-html-checker/

Email:

ex*****@a1local.com.au

Website:

https://a1local.com.au/extensions/support/

Is A1 HTML Checker Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

A1 HTML Checker does not require any sensitive permissions.

Risk impact analysis details

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

A1 HTML Checker is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
High **** ********* *** ******** ****** *** ********** *** *** ** ****** ** *****
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****