Last updated: November 5, 2026
Plumbline is a Chrome extension that lets you inspect and copy the CSS of elements on web pages. This policy explains exactly what it does with data.
When you start Plumbline on a tab, it reads that page's HTML, text and CSS on your computer, to show them in its panel and to copy them when you ask. This is website content. It does not run on any page until you start it, and it stops when you close it. The first time, it shows a short notice and only starts if you agree.
While it is on, it listens to mouse position, clicks, scrolling and key presses on that tab only to pick elements and run its shortcuts. These are not recorded, stored or sent.
Only your display settings and the fact that you agreed to the notice, saved on your own computer through Chrome's storage. Nothing from the pages you visit is stored.
Plumbline has no servers, no analytics, no advertising and no accounts, so nothing is sent to the developer. Its only network request is the stylesheet download described below. Text you copy goes only to your clipboard. Values in password and form fields, and hidden inputs, are left out of copies. Text shown on the page is copied as shown.
A page may load its CSS from another site. To show those rules, Plumbline's service worker downloads that stylesheet again, over HTTPS (or HTTP if the page itself is on your own computer), from the same address the page already uses, without your cookies and without a referrer. That site sees your IP address, the file's address, and that the request came from a Chrome extension. If the site does not allow this, Plumbline shows computed values instead.
Plumbline handles website content and these input events only on your computer. It does not send them to the developer, and it does not sell or transfer them to anyone. The use of information received from Google APIs adheres to the Chrome Web Store User Data Policy, including the Limited Use requirements.
If this ever changes, this page will be updated before the extension is, and the extension's listing will say so.
Shahzaib Malik, Pakistan. Email: anchorperson1@gmail.com