Is uBlock Origin Actually Blocking Anything? The One-Tab Check

Author : Wren Halloway | Published On : 03 Nov 2026

uBlock Origin never announces itself. No popups, no congratulatory counters, no mascot begging for attention, which is exactly why people doubt it. A site loads, a few slots look empty, and a small question forms: is this thing doing anything? You can answer it with one tab and about forty seconds, no settings spelunking required.

Read the badge first

The toolbar icon carries a small number. That is the count of requests uBlock has blocked on the current tab, and it updates live as the page loads. On an ad-heavy news site you should see double or triple digits within a second or two. On a personal blog, single digits are normal, and zero on a page with no trackers is fine too. The number itself is not a grade; it is context. You are looking for the right number on the right kind of page.

For ground truth, click the icon and open the logger. Every request the page makes scrolls past in real time, with blocked ones marked in red and allowed ones left plain. Watching ten red lines stack up in two seconds settles the question better than any FAQ ever will. It also shows what a page actually tries to load, which is quietly educational the first time you see it.

When you want a structured answer instead of vibes, load a page made for a ublock test. It plants bait that mimics real ad traffic: image URLs following banner-network naming, scripts from lookalike ad domains, empty boxes dressed with the class names actual ads use. Your uBlock checks every bait request against EasyList and its privacy lists, the same lists it applies everywhere else. If the page's counter shows blocked requests while the fake banners stay hollow, your setup is doing exactly what it should.