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Browser Extensions · head to head

Mercury Reader vs uBlock Origin

M

Mercury Reader

Browser Extensions

Clear clutter from articles instantly

From
Free
Rated
-
Full reviewWebsite
uBlock Origin logo

uBlock Origin

Browser Extensions

Free, open-source ad content blocker

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Mercury Reader mercury Reader's underlying engine (Postlight Parser) is free open source software licensed under Apache License 2.0, per the GitHub repository, with no paid tier; uBlock Origin cNAME uncloaking of third-party trackers disguised as first-party is only available on Firefox, because the required DNS API does not exist in Chromium
  • They diverge on capability: Mercury Reader covers Content extraction, uBlock Origin covers Ad blocking.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Mercury Reader and uBlock Origin actually diverge.

Attributes where Mercury Reader and uBlock Origin differ
AttributeMercury ReaderuBlock Origin
PlatformsChrome, Firefox, EdgeChrome, Firefox, Edge, Opera
Founded20152014

Identical on both: starting price (Free), pricing model (free), free tier (Yes), user rating (Not yet rated), category (Browser Extensions).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Mercury Reader

  • Content extraction
  • Clean reading view
  • Custom themes
  • Font customization

Only in uBlock Origin

  • Ad blocking
  • Tracker blocking
  • Malware domain blocking
  • Custom filter lists
  • Opera support

Both cover

  • Chrome support
  • Firefox support
  • Edge support

What people use each for

The jobs each tool is most often brought in to do.

Mercury Reader

No use cases recorded yet. See the Mercury Reader review.

uBlock Origin

  • Ad and tracker blocking in web browsersnot Mercury Reader
  • Privacy protection while browsing the webnot Mercury Reader
  • Reducing bandwidth usage by blocking adsnot Mercury Reader
  • Users seeking open-source browser extensionsnot Mercury Reader

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Mercury Reader

  • Mercury Reader's underlying engine (Postlight Parser) is free open source software licensed under Apache License 2.0, per the GitHub repository, with no paid tier

uBlock Origin

  • CNAME uncloaking of third-party trackers disguised as first-party is only available on Firefox, because the required DNS API does not exist in Chromium
  • HTML filtering of response bodies requires the webRequest.filterResponseData API, which is only available in Firefox
  • On Chromium-based browsers uBO is not reliably ready at browser launch, so tracker and advertisement payloads can reach already-open tabs before filtering starts
  • Pre-fetch blocking is not reliable on Chromium-based browsers because they give websites precedence over user settings
  • The Chromium build does not use the WebAssembly filtering code paths, because the extra manifest permission would create friction publishing to the Chrome Web Store
  • LZ4 storage compression is Firefox only, and on Chromium in incognito mode IndexedDB resets, so uBO launches with out-of-date filter lists

Pricing, plan by plan

Mercury Reader

Free
  • FreeFree
    • Clutter removal
    • Clean reading
    • Custom themes

uBlock Origin

Free
  • FreeFree
    • Ad blocking
    • Tracker blocking
    • Custom filter lists

Which should you pick?

Choose Mercury Reader if

  • You need content extraction.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge.
  • You also want clean reading view.
Mercury Reader review

Choose uBlock Origin if

  • You need ad blocking.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Opera.
  • You also want tracker blocking.
uBlock Origin review

Questions people ask

Is Mercury Reader or uBlock Origin better?
Neither clearly leads. Mercury Reader starts at Free and uBlock Origin at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mercury Reader or uBlock Origin?
Mercury Reader starts at Free and uBlock Origin at Free.
Does Mercury Reader or uBlock Origin run on more platforms?
Mercury Reader runs on Chrome, Firefox, Edge. uBlock Origin runs on Chrome, Firefox, Edge, Opera.
Can I use Mercury Reader for free?
Both have a free tier, so you can try either at no cost before committing.
What can Mercury Reader do that uBlock Origin cannot?
Mercury Reader covers Content extraction, Clean reading view, Custom themes, Font customization. uBlock Origin covers Ad blocking, Tracker blocking, Malware domain blocking, Custom filter lists. Both handle Chrome support, Firefox support, Edge support.

Answered from the vendors’ own pages

uBlock Origin: How much does uBlock Origin cost?

uBlock Origin is completely free and open-source software with no licensing fees, subscriptions, or commercial restrictions.

Source
uBlock Origin: Is uBlock Origin open source?

Yes, uBlock Origin is distributed under the GPL-3.0 License with source code publicly available on GitHub. The project encourages community review and contribution.

Source
uBlock Origin: Does uBlock Origin accept donations?

No, uBlock Origin explicitly does not accept donations. The project instead encourages users to support the developers maintaining the filter lists that power the extension.

Source
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