Your opinion counts in refining uBlock. [Check out the current poll about uBlock](https://chrismatic.typeform.com/to/GOoKBy). Thank you.

<table width="100%">
      <tr>
      <td align="left" width="70">
            <a href = "https://www.ublock.org/">
            <img  src="https://raw.githubusercontent.com/chrisaljoudi/uBlock/master/doc/img/gh-header.png"
                  height="64">
            </a>
      </td>
      <td align="right" width="20%">
            <a href="https://travis-ci.org/chrisaljoudi/uBlock">
                  <img src="https://travis-ci.org/chrisaljoudi/uBlock.svg?branch=master" alt="Build status">
            </a>
            <a href="https://www.ublock.org/donate">
                  <img src="https://chrismatic.io/oncedonate.svg" alt="Support development">
            </a>
      </td>
      </tr>
      <tr>
      <td colspan="2">
            <strong><a href="https://www.ublock.org/">uBlock</a></strong>: an efficient blocker extension for your browser. Fast, potent, and lean.
      </td>
      </tr>
</table>

* [Getting Started & Installation](#getting-started)
* [Performance & Benchmarks](#performance)
* [Tips](#tips)
* [FAQ](https://www.ublock.org/faq/)
* [About](#about-ublock)

## Getting started

#### Installation:

* **Chrome**: available on the [Chrome Web Store](https://chrome.google.com/webstore/detail/ublock/epcnnfbjfcgphgdmggkamkmgojdagdnn) or for [manual](https://github.com/chrisaljoudi/uBlock/tree/master/dist#install) installation.

* **Safari**: available to install [from the homepage](https://www.ublock.org/), or from the [Safari Extension Gallery](https://extensions.apple.com/details/?id=net.gorhill.uBlock-96G4BAKDQ9).

* **Firefox**: available on the [Firefox Add-ons site](https://addons.mozilla.org/en-US/firefox/addon/ublock/), or for [manual](https://github.com/chrisaljoudi/uBlock/releases) installation.

 * Due to Mozilla's review process, the version of uBlock available from the Add-ons homepage is currently often outdated. This isn't in our control.

* **Opera**: Opera shares Chrome's underlying engine, so you can install uBlock simply by grabbing the [latest release for Chrome](https://github.com/chrisaljoudi/uBlock/releases/latest).

uBlock has tooltips throughout its UI to help you along. But just in case you need it, [here's a quick guide for basic usage](https://github.com/chrisaljoudi/uBlock/wiki/Quick-guide:-popup-user-interface).

## Performance

#### Memory

<p align="center">
On average, uBlock <b>really</b> does make your browser run leaner. <sup>[1]</sup><br><br>

Chrome <br>
<img src="https://raw.githubusercontent.com/chrisaljoudi/uBlock/master/doc/benchmarks/mem-usage-overall-chart-20141224.png" /><br><br>

Safari<br>
<img src="https://raw.githubusercontent.com/chrisaljoudi/uBlock/master/doc/benchmarks/mem-usage-overall-chart-safari-20150205.png" /><br><br>

Firefox<br>
<img src="https://raw.githubusercontent.com/chrisaljoudi/uBlock/master/doc/benchmarks/mem-usage-overall-chart-20150205.png" /><br><br>

</p>

<sup>[1] An overview of the benchmark is available at <a href="https://github.com/chrisaljoudi/uBlock/wiki/Benchmarking-memory-footprint">this wiki page</a>.</sup><br>

#### CPU

<p align="center">
uBlock is also CPU-efficient<br>
<img src="https://raw.githubusercontent.com/chrisaljoudi/uBlock/master/doc/benchmarks/cpu-usage-overall-chart-20141226.png" /><br>
<sup>Details of the benchmark available in <a href="https://github.com/chrisaljoudi/uBlock/blob/master/doc/benchmarks/cpu-usage-overall-20141226.ods">this LibreOffice spreadsheet</a>.</sup>
</p>

#### Blocking

<p align="center">
Being lean and efficient doesn't mean blocking less<br>
<img src="https://raw.githubusercontent.com/chrisaljoudi/uBlock/master/doc/benchmarks/privex-201502-16.png" /><br>
<sup>For details of benchmark, see 
<a href="https://github.com/chrisaljoudi/uBlock/wiki/uBlock-and-others%3A-Blocking-ads%2C-trackers%2C-malwares">uBlock and others: Blocking ads, trackers, malwares</a>.
</p>

**Some quick tests:**

<sub>These tests are by no means complete or comprehensive, but do remain helpful.</sub>

- [Index](http://raymondhill.net/ublock/tests.html)
- [Web page components](http://raymondhill.net/ublock/tiles1.html)
- [Popups](http://raymondhill.net/ublock/popup.html)

## Tips

* **To benefit from uBlock's higher efficiency,** it's advised that you don't use other inefficient blockers at the same time (such as AdBlock or Adblock Plus). uBlock will do [as well or better](#blocking) than most popular ad blockers.

* It's important to note that blocking ads [is *not* theft](https://twitter.com/LeaVerou/status/518154828166725632). Don't fall for this creepy idea. The _ultimate_ logical consequence of `blocking = theft` is the criminalisation of the inalienable right to privacy.

* _EasyList_, _Peter Lowe's Adservers_, _EasyPrivacy_ and _Malware domains_ are enabled by default when you install uBlock. Many more lists are readily available to block trackers, analytics, and more. Hosts files are also supported.

* Once you install uBlock, you can easily un-select any of the pre-selected filter lists if you think uBlock blocks too much. For reference, Adblock Plus installs with only _EasyList_ enabled by default.

* Feel free to read [about the extension's required permissions](https://github.com/chrisaljoudi/uBlock/wiki/About-the-required-permissions).

## About uBlock

Some users might want to check out [uBlock Origin](https://github.com/gorhill/uBlock): a noteworthy personal fork of uBlock from @gorhill with a slightly different featureset.

uBlock is a general-purpose blocker — not an *ad blocker* specifically. uBlock's main goal is to help users neutralize privacy-invading apparatus — ads being one example.

uBlock blocks ads through its support of the [Adblock Plus filter syntax](https://adblockplus.org/en/filters). uBlock [extends](https://github.com/chrisaljoudi/uBlock/wiki/Filter-syntax-extensions) the syntax and is designed to work with custom rules and filters.

Free and open-source. For users, by users. If uBlock is useful to you, [donations to support development are much appreciated](https://chrismatic.io/ublock/).

[Feel free to read about uBlock's development philosophy](https://chrismatic.io/ublock/philosophy) and [uBlock's manifesto](MANIFESTO.md).

*Acknowledgment:* uBlock comes with several filter lists ready to use out-of-the-box (including but not limited to: EasyList, Peter Lowe's, several malware filter lists). We deeply appreciate the people working hard to maintain those lists which are available to use by all for free.

## License

[GPLv3](https://github.com/chrisaljoudi/uBlock/blob/master/LICENSE.txt).