Why You Need More Than One Privacy Extension
A single extension can't cover everything. Ad blockers stop trackers in filter lists but miss new ones. URL cleaners remove tracking parameters but don't block scripts. History tools keep your data local but don't affect what third parties collect during your session.
Privacy Chrome extensions work best in layers. Each one in this list solves a different piece of the problem, and they don't significantly conflict with each other when used together. I'll go through each one honestly, including what it actually does and where its limits are.
1. uBlock Origin
What it does: Blocks ads, trackers, malicious scripts, and unwanted third-party requests using curated filter lists including EasyList, EasyPrivacy, and uBlock's own lists.
uBlock Origin is the foundation of any serious privacy setup. It works at the network level, intercepting requests before they're made, which means it blocks trackers without injecting JavaScript into pages. The performance impact is negative (pages load faster) because you're downloading fewer resources.
The filter lists update automatically. When a new tracking domain gets identified and added to EasyPrivacy or another list, uBlock Origin will start blocking it without you doing anything. The community-maintained lists are comprehensive and regularly updated.
One thing people miss: uBlock Origin is also a scriptblocker. In medium or hard mode (configurable in the dashboard), you can block all third-party scripts by default and selectively whitelist what you need. This is more aggressive than the default setup, but it dramatically reduces the attack surface for browser-based exploits. Most users don't go that far, but the option is there.
The extension is genuinely free with no paid tier, no data collection, and an open-source codebase you can audit. It's maintained by a single developer (gorhill) and a community of contributors who have been working on it for years.
Limitation: Filter lists only catch known trackers. A brand-new tracker on a niche site won't be blocked until someone identifies it and adds it to a list.
2. Privacy Badger
What it does: Learns which trackers to block based on your personal browsing behavior, catching trackers that filter lists miss by detecting cross-site tracking patterns.
Privacy Badger from the EFF takes a different approach to uBlock Origin. Instead of relying on curated lists, it watches your browsing and identifies when the same third-party domain is loading across multiple unrelated sites. If a tracker appears on three or more unrelated sites without a clear user-facing reason to be there, Privacy Badger starts blocking or cookie-blocking it.
The practical benefit is that Privacy Badger can catch new and obscure trackers that haven't made it into uBlock Origin's filter lists yet. The two extensions complement each other rather than duplicating effort.
Privacy Badger has gotten smarter about handling the tension between privacy and functionality. It's improved its heuristics to avoid breaking sites when it blocks something that turns out to be needed for login or payment processing. Most users run it for months without any breakage, but you can manually whitelist specific domains if something stops working.
Limitation: The learning-based approach means Privacy Badger is less aggressive than uBlock Origin in advanced modes. If you're using uBlock in medium/hard mode, Privacy Badger adds less incremental value, but for default uBlock users it's a meaningful addition.
3. ClearURLs
What it does: Automatically removes tracking parameters from URLs before you navigate to them, preventing sites from knowing you clicked a link in a specific email, tweet, or ad.
When you click a link from an email, a search result, or a social media post, the URL often contains tracking parameters that tell the destination site where you came from and who you are. Something like ?utm_source=newsletter&utm_medium=email&fbclid=abc123 tells the destination site you clicked from a specific newsletter, and the Facebook click ID (fbclid) helps Facebook confirm you visited that page.
ClearURLs strips these parameters before you navigate, so the destination site gets a clean URL without the tracking metadata. It handles thousands of tracking parameter patterns from Google, Facebook, Amazon, Twitter, and many others.
This matters even if you're blocking ads. UTM parameters and click IDs are passed in the URL itself, not through a script, so ad blockers don't catch them. ClearURLs operates at a different layer and handles the URL before the request is made.
The extension is lightweight, open-source, and runs entirely locally without any network requests of its own. It's a set-and-forget tool that requires no configuration for most users.
Limitation: ClearURLs occasionally breaks affiliate links or referral tracking that the site owner legitimately uses. If you click a referral link for a product and the referral doesn't credit the person you intended to support, it's because ClearURLs stripped the referral parameter. You can disable it temporarily for specific sites.
4. LocalCDN (or Decentraleyes)
What it does: Intercepts requests to content delivery networks (CDNs) for common JavaScript libraries and serves them locally from a cached copy, preventing CDN operators from tracking your visits.
This one is less well-known but addresses a real tracking vector. When sites load jQuery, Bootstrap, React, or other common libraries from a CDN like Google's ajax.googleapis.com or Cloudflare's CDN, the CDN operator can log that your IP visited a site that uses their CDN. By intercepting these requests and serving locally-cached versions, LocalCDN prevents the CDN from seeing your browsing.
LocalCDN is the more actively maintained fork of the original Decentraleyes extension, with a broader catalog of intercepted libraries. Both work the same way: instead of making a network request to ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js, the extension serves you its local copy and the request never reaches Google.
The performance benefit is real too: local file serving is faster than even well-cached CDN requests.
Limitation: LocalCDN only helps if the CDN request matches one of its cached entries. For CDN resources it doesn't have locally, the request goes through normally. This is a narrower privacy improvement than uBlock Origin, but it's additive and has no meaningful downside.
5. TraceMind
What it does: Captures the full text content of every page you visit, indexes it locally using semantic search (all-MiniLM-L6-v2, 384 dimensions), and lets you search your browsing history by meaning instead of just keywords. Everything stays in your browser's IndexedDB.
TraceMind belongs in a privacy extensions list for a specific reason: it's an alternative architecture to cloud-based history sync. If you use Chrome with Google account sync, your browsing history goes to Google's servers. If you want to keep a searchable record of your browsing without that data leaving your machine, TraceMind is how you do it.
The extension uses Mozilla's Readability library to extract meaningful content from pages (the same library Firefox uses for Reader Mode), then generates a 384-dimensional semantic embedding using a small ML model running via WebGPU or WASM inside your browser. Search results combine vector similarity (for meaning-based matching) and FlexSearch full-text results, merged with Reciprocal Rank Fusion for better relevance.
The result: you can type "that article about caching and database indexing" and find the right page even if the words "caching" and "database indexing" never appeared in the URL or title. Search latency is under 100ms because everything happens locally with no server round-trip.
Privacy-wise, the only external call TraceMind makes is Pro license validation. No content, no search queries, no page URLs leave your browser. You can verify this in Chrome DevTools by watching the Network tab during indexing and search.
The free tier covers unlimited pages, 365-day retention, and full semantic search. Install it from the Chrome Web Store and see for yourself. More on what the Pro features add at tracemind.app/features.
Limitation: TraceMind indexes browser content only. It doesn't capture desktop apps, screenshots, or images without alt text. And like any history tool, it accumulates data on your device, so if your local machine is compromised, that data is accessible. The optional AES-256-GCM encryption in the Pro tier mitigates this.
How These Extensions Work Together
Each extension in this list operates at a different layer:
- uBlock Origin: network-level blocking of known trackers and ads
- Privacy Badger: behavioral detection of unknown cross-site trackers
- ClearURLs: URL cleaning before navigation
- LocalCDN: interception of CDN resource requests
- TraceMind: local indexing of page content for semantic history search
They don't step on each other. I've been running all five simultaneously for months without any meaningful site breakage, and the combination covers more ground than any single extension could.
The order I'd recommend adding them: start with uBlock Origin (highest impact, lowest effort). Add Privacy Badger. Add ClearURLs. Add LocalCDN. Add TraceMind if local history search sounds useful to you.
What About HTTPS Everywhere?
HTTPS Everywhere, previously recommended in most privacy extension guides, is no longer necessary. Chrome, Brave, and Edge now have "Always use secure connections" settings built into the browser that do the same thing natively. Enable it in your browser settings and remove HTTPS Everywhere if you have it. The extension itself has been deprecated by the EFF, who created it.
The Bigger Picture
Extensions protect you at the browser level, but they're one layer in a larger threat model. For most people, the combination above covers the most common and impactful privacy risks: third-party ad trackers, cross-site tracking, URL-based tracking, CDN fingerprinting, and cloud-stored browsing history.
If you want to go further, consider a privacy-focused search engine (DuckDuckGo, Brave Search, or Kagi) as your default. Consider Firefox as a browser, which has stronger built-in tracking protection. And consider what your DNS provider can see, since all your browsing generates DNS queries regardless of what your browser does.
For browser-specific privacy decisions, the privacy-first extensions comparison goes deeper into on-device vs. cloud processing tradeoffs.
But for most users, getting these five extensions installed and configured is 80% of what matters. Start there.