uBlock Origin on Firefox: the full version still works

Chrome dropped it. Firefox kept it. Here is what that means.

Updated: October 30, 2026

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If you miss the original uBlock Origin, Firefox is where it still runs in full. Chrome disabled it when it moved every extension to Manifest V3, but Mozilla decided to keep supporting the feature uBlock Origin depends on.

Why uBlock Origin still works in Firefox

uBlock Origin inspects each request a page makes in real time and decides whether to block it. Chrome removed that ability for ad blockers with Manifest V3. Mozilla adopted Manifest V3 too, but kept support for the blocking feature that tools like uBlock Origin use, so the full version keeps working.

uBlock Origin (Firefox) vs uBlock Origin Lite (Chrome)

uBlock Origin in FirefoxuBlock Origin Lite in Chrome
Blocking methodLive, per requestRules declared in advance
Custom filter listsAny listLimited
Element pickerFullReduced
Reacts to YouTube changesFast, via list updatesSlower
Works on AndroidYes, in Firefox for AndroidNo (Chrome mobile has no extensions)

How to install uBlock Origin in Firefox safely

  1. Open the official Firefox Add-ons site (addons.mozilla.org) and search for "uBlock Origin".
  2. Check that the developer is Raymond Hill (gorhill) and that it is marked as recommended.
  3. Click "Add to Firefox" and confirm.
  4. Avoid look-alike add-ons with similar names: several copycats exist.

Should you switch from Chrome to Firefox?

If full uBlock Origin matters most to you, Firefox is the simplest way to keep it. If you prefer to stay in Chrome because of your bookmarks, passwords or work tools, a Manifest V3 blocker such as uBlock Origin Lite or Qhawa covers most ads.

What Qhawa does

Qhawa is for people who stay in Chrome: it blocks ads and trackers with public lists like EasyList, removes YouTube ads, and warns about known phishing and malware pages. It is free and never charges advertisers.

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Frequently asked questions

Is uBlock Origin still available for Firefox?

Yes. The full uBlock Origin is available on the official Firefox Add-ons site, on desktop and on Firefox for Android.

Will Firefox drop uBlock Origin like Chrome did?

Mozilla has said it will keep supporting the blocking feature that uBlock Origin relies on, even with Manifest V3.

Can I use uBlock Origin on my phone?

Yes, in Firefox for Android. Chrome on Android and iPhone does not support extensions.

Sources

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