Plumbtern privacy policy

Plumbtern: On-Page SEO Checker, published by Zydeno. Last updated 3 November 2026.

In short

The extension stores data only in your browser (storage.local). Nothing is sent to Zydeno or anyone else. There are no analytics, no accounts and no network requests.

What the extension reads

When you click its toolbar button or press its shortcut, Plumbtern reads the page in the active tab: tags in the head, headings, image and link attributes, and visible text for the word count. The result is shown in the popup. It is not sent anywhere and not saved, unless you ask for it as described below.

What is stored on your device

• Your language and theme, if you change them in Settings.
• Baselines, only when you press Save as baseline: the page address, the date, the title, description, canonical, robots, H1, hreflang, Open Graph and social card tags, JSON-LD types, language, and counts of headings, images, links and words.

You can delete baselines in the popup or in Settings. Removing the extension removes this data. An export file is created only when you press Export, and it stays where you save it.

Permissions

• activeTab: gives access to the open tab only after you click the button or press the shortcut, until that tab goes to another page.
• scripting: runs the read-only check in that tab, and outlines an element when you ask to see it on the page.
• storage: keeps your settings and baselines on this device.

The extension does not ask for access to all websites, your tabs list, history or downloads, and runs no code on a page before you click.

Clipboard

Copy buttons place the report on your clipboard only when you press them.

Children

The extension collects no personal data from anyone, including children.

Changes

If this policy changes, the new version is published at this address with a new date.

Contact

Zydeno, [email protected]