Privacy Policy – Blockium

1. Core Philosophy: Absolute Zero Telemetry

Blockium was built on a foundational principle: your browsing activity is private, personal, and belongs exclusively to you.

Unlike legacy ad blockers and commercial extensions that inject telemetry SDKs, track visited domains, or monetize anonymized analytics, Blockium maintains a strict Zero-Telemetry Architecture. We do not operate external tracking servers, analytics endpoints, or remote profiling databases.

          The Blockium Privacy Promise: We do not track, collect, store, log, or transmit your browsing history, search queries, IP address, form inputs, or visited URLs under any circumstances.
        

2. Information We Do NOT Collect

For absolute clarity, Blockium does NOT collect, inspect, or transmit any of the following:

Personal Identifiable Information (PII): No names, email addresses, phone numbers, or account credentials. You can use Blockium immediately without creating an account or logging in.
Browsing History & URLs: Filter rules are evaluated natively inside your local Chrome browser memory. The URLs of websites you visit are never logged or sent to any remote server.
Form Data & Passwords: Blockium has zero access to user passwords, credit card numbers, or form submissions.
Analytics & Fingerprinting: We do not use Google Analytics, Mixpanel, Amplitude, or any third-party behavioral analytics scripts inside the extension or on our marketing website.

3. Local On-Device Data Storage

Blockium uses Chrome's local storage API (chrome.storage.local) strictly on your personal device to preserve your preferences across browser sessions:

Active Module Toggles: Your customized preferences (e.g., whether Cookie Auto-Dismiss or Threat Alerts are enabled).
Custom Filter Rules: Elements you manually remove using the Visual Element Zapper are saved as local CSS selectors on your device.
Domain Whitelist: Websites where you have toggled protection OFF or allowed cookie notices.
Aggregate Local Statistics: Total count of blocked ads and estimated data saved. These metrics are stored in your local browser storage and are never uploaded.

4. Chrome Permissions & Plain-English Justification

In accordance with Google Chrome Web Store Developer Program Policies, here is the exact technical justification for every permission declared in our manifest.json:

Permission	Technical Function & User Benefit
declarativeNetRequest	Enables Chrome's native C++ engine to block ad servers and tracking requests before page content renders, without transmitting network traffic to any external server.
declarativeNetRequestWithHostAccess	Allows custom cosmetic rules and scriptlets to be targeted safely to user-specified domains.
storage	Required to save your user settings (theme preference, whitelisted websites, custom zapper rules) locally on your device.
tabs & webNavigation	Used solely to update the extension toolbar icon badge showing the number of blocked ads on your active tab, and to detect tab navigation to reset per-tab counters.
alarms	Used to schedule periodic local updates of open-source filter lists (e.g. EasyList) in the background.
notifications	Used exclusively to display optional local desktop alerts when a known malware or phishing URL is intercepted.
<all_urls>	Necessary for content scriptlets to suppress video ad interruptions (e.g., YouTube), auto-dismiss cookie banners, and apply cosmetic element hiding across all visited domains.

5. Third-Party Services & Network Requests

Blockium does not transmit user data to any third party. The only outbound network requests made by the extension are:

Filter List Updates: The extension periodically downloads updated public, open-source filter rule lists from established repositories (such as https://easylist.to and https://raw.githubusercontent.com). These requests are standard HTTP GET requests for static text files and contain zero user telemetry.

6. Data Deletion & User Control

Because all settings and stats exist strictly on your local machine, you have complete and immediate control over your data:

Clearing Storage: You can clear all custom rules and whitelists at any time directly in the extension dashboard by clicking "Reset to Defaults".
Uninstalling: Removing Blockium from Google Chrome immediately and permanently erases all locally stored extension data from your machine.

7. Contact Information

If you have questions, feedback, or verification requests regarding this Privacy Policy or Blockium's security architecture, please contact us:

Email: blockiumapps@gmail.com
Official Website: https://blockium.pages.dev
Issue Reporting: https://blockium.pages.dev/report