Privacy Policy

Last updated: September 3, 2026

Overview

Modern Frontend Inspector (“MFI”, “the extension”) is a Chrome browser extension for inspecting and editing the computed CSS of web pages. This policy explains what data MFI handles — and, just as importantly, what it does not.

The short version: MFI does not collect your browsing data. There are no analytics, no telemetry, no tracking scripts, and no advertising identifiers anywhere in the extension or on this website.

Information we do not collect

MFI deliberately has no mechanism for collecting the following. This is not a promise to be careful with this data — the extension contains no code that transmits it:

• Inspected page content. The DOM, HTML, CSS, computed styles and other inspected page data are processed locally in your browser and are not sent to the MFI licensing service or to any third-party server.
• Browsing history. MFI does not read, record or transmit your browsing history.
• Analytics and telemetry. The extension and this website contain no analytics, telemetry, error-reporting, session-replay or advertising SDKs (no Google Analytics, Plausible, Hotjar, Meta Pixel, or similar).
• Remote code. MFI does not fetch or execute remote code at runtime. All code ships inside the extension package.

Information we collect

The Free plan does not require personal information or licensing activation. The extension does not make licensing requests while you use Free functionality.

If you purchase a Pro license, a minimal amount of data is processed solely to deliver that license:

• Purchase data (processed by Lemon Squeezy — see below): name, email address, billing information, and the transaction record.
• License data: license-related data may include a license-key fingerprint, product and variant information, activation/instance state, and the lifecycle information required to validate and manage the entitlement.

The licensing service handles entitlement activation, validation and lifecycle with only the minimum data required. It does not receive, store or process inspected page DOM, HTML, CSS, computed styles or page content.

How we use information

License-related data is used only to:

• Verify a license key during activation in the extension;
• Enforce the activation limit configured for the license;
• Provide support when you contact us about a purchase;
• Comply with legal and accounting obligations arising from sales.

Third-party services

Lemon Squeezy (payments, Merchant of Record)

Pro purchases are processed by Lemon Squeezy as Merchant of Record. When you buy a license, Lemon Squeezy processes your payment and billing information, handles applicable taxes, and manages your billing records under its own privacy policy. The MFI licensing service receives the minimum information required to validate and manage your entitlement. The licensing service does not retain customer names or email addresses in its license store. We never receive or store full payment card details.

Lemon Squeezy’s privacy policy: https://www.lemonsqueezy.com/privacy

Data retention

• Inspected page data: not retained anywhere — it never leaves your browser. Edits you make are held in the extension’s local session history on your device and are discarded there.
• License records: retained for as long as your license is active and as required for accounting and tax compliance.
• Support correspondence: retained for as long as needed to resolve your request.

Your choices and rights

Because MFI does not build profiles or collect browsing data, there is nothing to opt out of inside the product. You may:

• Use the entire Free plan without providing any personal information;
• Request a copy or deletion of your license record by contacting us (we may retain what accounting law requires);
• Exercise your rights under applicable law (such as GDPR access or deletion rights) by contacting us.

Changes to this policy

If this policy changes, the updated version will be posted on this page with a new effective date.