What uBlock Origin does and why you might want it
uBlock Origin is a free extension that stops ads, trackers, and some malicious scripts from loading on websites you visit. It runs on Firefox, Chrome, Edge, and Safari. Unlike some ad blockers, uBlock Origin does not sell your browsing data to advertisers — it is maintained by volunteers and funded by donations.
Installing it takes about two minutes. The extension sits in your browser toolbar and starts working on every page you load. You can turn it off for specific websites if a site breaks or if you want to support a creator you trust, and you can adjust what it blocks using its settings panel.
The main trade-off: some websites detect ad blockers and ask you to disable them before you can read content. A few block you entirely. Most do not. Whether that trade-off is worth it depends on how much ad clutter bothers you and how much you value the privacy benefit of blocking trackers.
Key Takeaways
- uBlock Origin installs from your browser's official extension store in under two minutes and requires no account or payment.
- The extension blocks ads and trackers by default, but you can pause it on individual websites if a page does not load correctly.
- Some websites detect ad blockers and ask you to turn them off; most do not, but you should expect to encounter this occasionally.
- After installation, the uBlock Origin icon appears in your toolbar — click it to see what it blocked on the current page or to adjust settings.
Installing uBlock Origin on Firefox
Open Firefox and go to addons.mozilla.org. In the search box at the top left, type "uBlock Origin". The first result should show the extension with a red and white icon. Click the blue "Add to Firefox" button.
A popup will ask you to confirm. Click "Add". Firefox will read and install the extension in seconds. You will see a notification that uBlock Origin has been added to your browser. The uBlock Origin icon (a red and white shield) will now appear in your toolbar at the top right of the browser window.
That is all. uBlock Origin starts blocking ads and trackers when ready on every page you visit. You do not need to restart Firefox or change any settings unless you want to.
Installing uBlock Origin on Chrome or Edge
Open Chrome or Edge and go to chromewebstore.google.com. In the search box, type "uBlock Origin". The first result will be the official extension with the red and white shield icon. Click on it.
Click the blue "Add to Chrome" button (or "Add to Edge" if you are using Edge). A popup will ask for confirmation. Click "Add extension". The browser will install it in seconds, and the uBlock Origin icon will appear in your toolbar.
Chrome and Edge work the same way as Firefox from this point forward. The extension is active when ready and requires no setup.
Installing uBlock Origin on Safari
Safari's extension store works differently. Open Safari and go to the App Store on your Mac (not the website — the App Store process). Search for "uBlock Origin". You will see an app called "uBlock Origin" with a red and white icon.
Click "Get", then "Install". You may be asked to sign in with your Apple ID. After installation, open Safari and go to Safari menu > Settings > Extensions. Find uBlock Origin in the list and check the box next to it to turn it on. You may also need to grant it permission to access websites — click "Allow" when prompted.
The uBlock Origin icon will appear in your Safari toolbar. It works the same way as on other browsers.
What to do if a website does not load correctly
Occasionally, uBlock Origin will block something a website needs to function. The page might load slowly, show blank spaces, or not load at all. This is rare, but it happens.
Click the uBlock Origin icon in your toolbar. You will see a dashboard showing what the extension blocked on that page. At the top left of the dashboard, you will see a large power button icon. Click it once to turn off uBlock Origin for that website only. Reload the page. If it loads correctly, you can leave the extension off for that site, or turn it back on after you are done.
To turn uBlock Origin back on for that site later, click the icon again and click the power button a second time. You can also click the power button while holding Ctrl (or Cmd on Mac) to turn it off temporarily for just that session.
Understanding what uBlock Origin blocks
By default, uBlock Origin blocks three categories of content: ads, trackers, and malware. You can see exactly what it blocked on any page by clicking the icon in your toolbar. The dashboard shows a list of blocked items organized by type.
You do not need to adjust these settings unless you want to. The default configuration blocks the most common threats without breaking most websites. If you want to change what gets blocked — for example, to allow certain trackers or to block more aggressively — you can access the settings by clicking the gear icon in the uBlock Origin dashboard.
Most people never touch the settings. The extension works well out of the box.
Websites that detect ad blockers
Some websites check whether you have an ad blocker running. If they detect one, they may ask you to turn it off before you can read the content, or they may block you from visiting at all. This is more common on news sites and entertainment sites than on others.
When this happens, you have three choices: turn off uBlock Origin for that site (click the power button in the dashboard), use a different browser where you have not installed the extension, or leave the site. There is no way to hide the fact that you are using an ad blocker from a website that is actively checking for it.
Some readers choose to turn off the extension for sites they trust or want to support. Others turn it off only when they need to access something they cannot get elsewhere. The choice is yours.
Frequently Asked Questions
Does uBlock Origin slow down my browser?
No. uBlock Origin uses very little memory and CPU. Most people notice no difference in browser speed after installing it. In some cases, pages load faster because the extension blocks heavy ad code from running.
Is uBlock Origin safe?
Yes. It is open-source, meaning anyone can read its code to verify what it does. It is maintained by volunteers and has been audited by security researchers. It does not collect your data or inject ads of its own.
Can I use uBlock Origin on my phone?
Firefox for Android supports extensions, including uBlock Origin, so you can install it there. Safari on iPhone does not support extensions in the same way, though some third-party browsers offer ad blocking. Chrome on Android does not support extensions.
What is the difference between uBlock Origin and other ad blockers?
uBlock Origin is lighter and faster than many alternatives. It does not sell data to advertisers or show its own ads. Some other ad blockers allow certain "acceptable ads" to pass through, or they have financial relationships with advertisers. uBlock Origin has none of these.
Do I need to pay for uBlock Origin?
No. uBlock Origin is completely free. It is supported by donations. Do not pay for any version of it — if someone is charging you money for uBlock Origin, it is not the real extension.