JustBlock Security
Extension Actions
Block ads, trackers, malware & phishing with MV3 rules. No data collection. Lightweight, fast, easy to use.
All-in-one PRIVACY and SECURITY layer for CHROME™ — helps protect against malicious extensions, fraudulent downloads, browser vulnerabilities, and online PRIVACY threats.
Safeguard your browser every time you access your EMAIL, BANK ACCOUNT, COMPANY DATA, or any other critical website.
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18-IN-1 SECURITY & PRIVACY PACK FOR CHROME™
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BLOCK ADS & TRACKERS — Blocks intrusive ads and advertising trackers across most websites.
BLOCK EMAIL TRACKERS — Stops invisible tracking pixels hidden inside emails.
BLOCK CRYPTO MINERS — Detects and blocks unauthorized in-browser cryptocurrency mining scripts.
GUARD AGAINST MALICIOUS DOWNLOADS — Warns about risky or suspicious file types that could contain harmful code.
FACEBOOK TRACKING CONTROL — Blocks Facebook™ tracking pixels and plugin telemetry while keeping chat and Like buttons functional.
PARENTAL CONTROL (OPTIONAL) — Blocks adult or inappropriate content (off by default).
PHISHING & SCAM DEFENSE — Helps reduce exposure to known phishing and scam pages.
CLICKBAIT & SEARCH HIJACK PROTECTION — Blocks deceptive redirects and fake search results.
BLOCK SUSPICIOUS SCRIPTS — Helps prevent hidden or cross-site scripts from running on untrusted pages.
COOKIE & TRACKING PREVENTION — Limits advertising networks and third-party cookies from profiling you.
LOCAL WHITELIST MODE — Instantly allow trusted websites with a single click.
LIGHTWEIGHT DESIGN — Uses Chrome’s built-in Manifest V3 Declarative Net Request engine for speed and reliability.
PRIVATE BY DEFAULT — No tracking, no analytics, and no remote servers.
ONE-TOGGLE CONTROL — Instantly enable or disable all protection features.
SECURE CLOUD ACCESS MODE — Keeps browser protections active when using cloud or SaaS platforms.
RULE-BASED URL FILTERING — Blocks known malicious or unsafe domains at the network level.
FAST & OPTIMIZED — Minimal CPU and memory usage; lightweight and efficient.
BUILT-IN LOCAL RULES — All protection rules are stored inside the extension and processed locally by Chrome.
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PRIVACY & TRANSPARENCY
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100 % local protection — no browsing data ever leaves your device.
No remote code, no telemetry, and minimal permissions (storage, declarativeNetRequest).
Built entirely on Manifest V3, Chrome’s most secure extension framework.
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TECHNOLOGY
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Manifest V3 Compliant
No Remote Code
Minimal Permissions
Runs Locally Inside Chrome
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JustBlock.org provides a modern privacy and security layer for Chrome™ — helping you stay safe from online threats, protect your privacy, and keep browsing fast and smooth.
As more of your work and personal data move to the cloud, Chrome™ remains your gateway to everything online. JustBlock adds the extra layer of protection your browser deserves.
JustBlock Security is developed and maintained by JustBlock.org.
Latest reviews
- Ken GCL
- I found that the updated version of JustBlock Security is blocking a Web site's use of jQuery's getScript function although it is a legitimate use case (to dynamically load interactive elements from within the same domain name in response to a user's clicks). Silent failures of legitimate functionality on Web sites is concerning, so I am removing the extension from my Web browser for now.
- Obudai Vagany
- Like most things nothing it's not perfect, but Its worth to have as an added layer for protection. Thanks
- Curtis L. L. Herbold
- Google is claiming this app doesnt follow the best practices and might be remved soon. PLEASE UPDATE.
- Batman Joker
- it's good but it can use a upgrade for the adblocker a bit more
- Batman Joker
- it's good but it can use a upgrade for the adblocker a bit more
- Daryl Port
- works like it should its the best i have seen on here
- Stuart Salazar
- BEST
- Stuart Salazar
- BEST
- DiVTatioN Skyline
- well blocking
- DiVTatioN Skyline
- well blocking
- Jill Hjelle
- Excellent, Thank you for offering me the option to protect my chrome book with FREE protection. Blessing indeed.
- Jill Hjelle
- Excellent, Thank you for offering me the option to protect my chrome book with FREE protection. Blessing indeed.
- Trixsohn
- Está muy bien, me gusta que tenga muchas opciones de seguridad que uno puede agregar o quitar :)
- antonio rocha
- muito bom
- Gerardo García Silva
- ES BUENA
- James Corbett (Jimbo)
- The extension does not keep the settings active that I configured in the extension menu. Block Popups is active on all sites regardless of how I set it up. i.e. I have it set up to only block blacklisted sites and I have not blacklisted any sites. Yet, all sites have popups blocked. I have a similar issue with Notifications being blocked when I have them unblocked. I appreciate the value of this extension as far as privacy and security are involved. I wish I did not have to disable the extension when I need a popup. I am a freemium user. Not asking for support.
- James Corbett (Jimbo)
- The extension does not keep the settings active that I configured in the extension menu. Block Popups is active on all sites regardless of how I set it up. i.e. I have it set up to only block blacklisted sites and I have not blacklisted any sites. Yet, all sites have popups blocked. I have a similar issue with Notifications being blocked when I have them unblocked. I appreciate the value of this extension as far as privacy and security are involved. I wish I did not have to disable the extension when I need a popup. I am a freemium user. Not asking for support.
- MPABS BAGIASTAS
- πολι καλο
- Mshaughi Manuel
- perfect
- Mshaughi Manuel
- perfect
- Ornán Rodríguez Velázquez
- Esta extensión está muy buena es genial
- Phạm Anh Khoa (SmallCircle)
- It's okay but somehow i feel like it makes the process become slower
- Phạm Anh Khoa (SmallCircle)
- It's okay but somehow i feel like it makes the process become slower
- Yan Bin Poon
- good!
- Yan Bin Poon
- good!
- Titas Trend
- Awesome Ultimate Tool for every AD!
- Titas Trend
- Awesome Ultimate Tool for every AD!
- Melódico Callejero
- es una exelente entenccion me encanta larecomiendo muchisimo
- Владимир Репринцев
- Пока что тестирую. Сегодня установил. Потом отпишусь, если не забуду. И да.....пришлось все расширения выключить из-за него. Посмотрим что выдет из этого рая.
- laura sofia mora
- no me funciono, hace poco se me descargo un virus
- JOAO B H SOARES
- muito bom
- David Siegel
- Awful. It slowed down the opening of new pages and tabs so much that I thought that I either had a virus or needed a new computer. My computer is old and my antivirus software came up clean. I decided to try turning off any extensions that I had added in the past few weeks and fortunately, I tried this one first. My computer immediately got faster, so this was the only extension that I had to try. It only affected my Chrome browser. Safari and Microsoft Edge were unaffected, probably because I only had it on Chrome. Maybe if my computer were newer, it wouldn't have been so bad, but it was for me. I originally just turned it off, but decided to remove it, since I have several other extensions that work without slowing down my Mac. I only reinstalled it to write this review, then it's gone again.
- David Siegel
- Awful. It slowed down the opening of new pages and tabs so much that I thought that I either had a virus or needed a new computer. My computer is old and my antivirus software came up clean. I decided to try turning off any extensions that I had added in the past few weeks and fortunately, I tried this one first. My computer immediately got faster, so this was the only extension that I had to try. It only affected my Chrome browser. Safari and Microsoft Edge were unaffected, probably because I only had it on Chrome. Maybe if my computer were newer, it wouldn't have been so bad, but it was for me. I originally just turned it off, but decided to remove it, since I have several other extensions that work without slowing down my Mac. I only reinstalled it to write this review, then it's gone again.
- Rhafael Vellozo
- Gostei muito so precisa melhora mas algumas coisas
- Mark Smile
- very useful
- Mark Smile
- very useful
- Vinh Quang Ngô
- very good
- Vinh Quang Ngô
- very good
- Stephen Burgos
- I like the options this extension gives me, but while using it I see a gradual slowdown of my browser until pages start freezing. This is especially pronounced while using bitbucket. I'm guessing there is some kind of memory leak in the extension.
- Stephen Burgos
- I like the options this extension gives me, but while using it I see a gradual slowdown of my browser until pages start freezing. This is especially pronounced while using bitbucket. I'm guessing there is some kind of memory leak in the extension.
- Bruce Wolfe
- There is no granular control of certain websites that require access to input devices, ie, microphone, speakers, etc. For instance, Google Voice now only works in the web browser for desktop. JustBlock Security extension blocks WebRTC and there is no way to whitelist GV that I can find for that specific function. If it is there then the extension is not intuitive enough and a full set of documentation is required or why believe any of us general lay-users would use it?
- Bruce Wolfe
- There is no granular control of certain websites that require access to input devices, ie, microphone, speakers, etc. For instance, Google Voice now only works in the web browser for desktop. JustBlock Security extension blocks WebRTC and there is no way to whitelist GV that I can find for that specific function. If it is there then the extension is not intuitive enough and a full set of documentation is required or why believe any of us general lay-users would use it?
- Anna Vipperman
- It works & is good, but I've run into an issue where I have to return to the Chrome web store because the JustBlock Security icon disappeared from the Extensions list in the top right corner, and every time, it says "This item has been disabled for Chrome." This has happened several times and it just keeps happening. Three stars because it's actually helpful, but this issue is getting on my nerves.
- Anna Vipperman
- It works & is good, but I've run into an issue where I have to return to the Chrome web store because the JustBlock Security icon disappeared from the Extensions list in the top right corner, and every time, it says "This item has been disabled for Chrome." This has happened several times and it just keeps happening. Three stars because it's actually helpful, but this issue is getting on my nerves.
- Jovica Milutinovic
- Good job
- Jovica Milutinovic
- Good job
- JOHN DOE
- awesome works well to keep out the junk
- JOHN DOE
- awesome works well to keep out the junk
- CALICA MARVIN R.
- super secured!!! loveet
- CALICA MARVIN R.
- super secured!!! loveet