NotebookLM Code Highlighter privacy policy

Last updated: November 2, 2026

NotebookLM Code Highlighter is a browser extension for Chrome and Firefox that adds syntax highlighting to code blocks in Google’s NotebookLM. This policy explains what data it handles.

Short version

• The extension does not collect, transmit or sell any data.
• It has no server, no analytics, no tracking and no ads.
• Everything it stores stays in your browser.

Where it runs

The extension only has access to notebooklm.google.com. There it reads the code blocks on the page so it can color them. It does not read anything else on the page and does not run on any other site.

What it stores in your browser

In the browser’s extension storage (storage.local):

• your settings: on or off, color theme and maximum block height;
• the languages you picked by hand, keyed by a short fingerprint (a hash) of each code block, so your choice sticks. The code itself is not stored. The list keeps only the most recent entries.

Uninstalling the extension deletes all of it.

What leaves your browser

Nothing. The extension makes no network requests. All code, including the highlighting library, ships inside the extension, and it does not download or run code from the internet.

Sharing and sale

The developer receives no data, so there is nothing to share or sell. Your data is not used for advertising, credit decisions or anything unrelated to highlighting code.

Changes

If this policy changes, the new version will be posted at this address with a new “Last updated” date.

Contact

Questions about this policy: support@koval.xyz