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# µBlock for Chromium
# <img src="https://raw.githubusercontent.com/gorhill/uBlock/master/src/img/icon_128.png"/>
**Foreword:** Using a blocker is **NOT** [theft](https://twitter.com/LeaVerou/status/518154828166725632). Do not fall for this creepy idea. The _ultimate_ logical consequence of "blocking = theft" is the criminalisation of the inalienable right to privacy.
## µBlock
See [releases page](https://github.com/gorhill/uBlock/releases) for recent changes.
See [Wiki](https://github.com/gorhill/uBlock/wiki) for more information.
**An efficient blocker for WebKit- and Blink-based browsers. Fast, potent, and lean.**
An efficient blocker for Chromium-based browsers. Fast and lean. Written from scratch. Development
through benchmarking.
> * [Purpose & General Info](#philosophy)
> * [Performance and Efficiency](#performance)
> * [Memory](#memory)
> * [CPU](#cpu)
> * [Blocking](#blocking)
> * [Installation](#installation)
> * [Release History](#release-history)
> * [Wiki](https://github.com/gorhill/uBlock/wiki)
**µBlock is not an "ad blocker", it's a blocker in the broad sense**, which happens to block ads through its support of [Adblock Plus filter syntax](https://adblockplus.org/en/filters). µBlock [extends](https://github.com/gorhill/uBlock/wiki/Filter-syntax-extensions) the syntax.
# Philosophy
_EasyList_, _Peter Lowe's Adservers_ , _EasyPrivacy_ are enabled by default when you install µBlock. Many more lists are readily available to protect yourself from trackers, analytics, data mining, and more ads. Hosts files are supported.
µBlock is not an *ad blocker*; it's a general-purpose blocker. µBlock blocks ads through its support of the [Adblock Plus filter syntax](https://adblockplus.org/en/filters). µBlock [extends](https://github.com/gorhill/uBlock/wiki/Filter-syntax-extensions) the syntax and is designed to work with custom rules and filters.
Ads are just the visible portions of privacy-invading apparatus entering your browser when you visit most sites nowadays.
That said, it's important to note that using a blocker 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.
My main goal with µBlock is to help users neutralize as much as can be privacy-invading apparatus (of which ads, "unintrusive" or not, are just the visible portion) for users who do not want to deal with more technical means like [µMatrix](https://github.com/gorhill/uMatrix).
Ads, "unintrusive" or not, are just the visible portions of privacy-invading apparatus entering your browser when you visit most sites nowadays. **µBlock's main goal is to help users neutralize such privacy-invading apparatus** — in a way that welcomes those users who don't wish to use more technical, involved means (such as [µMatrix](https://github.com/gorhill/uMatrix)).
_EasyList_, _Peter Lowe's Adservers_, _EasyPrivacy_ are enabled by default when you install µBlock. Many more lists are readily available to block trackers, analytics, and more. Hosts files are also supported.
# Performance
## Memory
<p align="center">
µBlock: on average, it <b>really</b> does make your browser run leaner<br>
On average, µBlock <b>really</b> does make your browser run leaner<br>
<img src="https://raw.githubusercontent.com/gorhill/uBlock/master/doc/benchmarks/mem-usage-overall-chart-20141224.png" /><br>
<sup>Details of the benchmark available in <a href="https://github.com/gorhill/uBlock/blob/master/doc/benchmarks/mem-usage-overall-20141224.ods">this LibreOffice spreadsheet</a>.</sup>
</p>
[**Important note re memory usage**: there is currently a [bug in Chromium 39+ which causes a new memory leak each time the popup UI of an extension is opened](https://code.google.com/p/chromium/issues/detail?id=441500). This affects *all* extensions. Just so you are informed memory figures won't be too reliable as soon as you opened even only once the popup UI of an extension. (In all my benchmarks I of course avoided to do this).]
**Important note regarding memory usage:**
<sup>There is currently a [bug in Chromium 39+ which causes a new memory leak each time the popup UI of an extension is opened](https://code.google.com/p/chromium/issues/detail?id=441500).</sup>
<sup>This affects *all* extensions.</sup>
<sup>As such, please be informed of that when measuring Chromium's memory usage. In the benchmarks, I avoided opening the popups completely.</sup>
## CPU
<p align="center">
µBlock: it is also easy on the CPU<br>
µBlock is also easy on the CPU<br>
<img src="https://raw.githubusercontent.com/gorhill/uBlock/master/doc/benchmarks/cpu-usage-overall-chart-20141226.png" /><br>
<sup>This gives an idea of the CPU overhead added by extensions relative to each other.<br>Details of the benchmark available in <a href="https://github.com/gorhill/uBlock/blob/master/doc/benchmarks/cpu-usage-overall-20141226.ods">this LibreOffice spreadsheet</a>.</sup>
<sup>Details of the benchmark available in <a href="https://github.com/gorhill/uBlock/blob/master/doc/benchmarks/cpu-usage-overall-20141226.ods">this LibreOffice spreadsheet</a>.</sup>
</p>
## Blocking
<p align="center">
Being lean doesn't mean blocking less.<br>
Being lean and efficient doesn't mean blocking less<br>
<img src="https://raw.githubusercontent.com/gorhill/uBlock/master/doc/benchmarks/privex-201409-30.png" /><br>
<sup>For details of benchmark, see latest
<sup>For details of benchmark, see
<a href="https://github.com/gorhill/uBlock/wiki/%C2%B5Block-and-others:-Blocking-ads,-trackers,-malwares">µBlock and others: Blocking ads, trackers, malwares</a>.
</p>
## Installation
From the [Chrome store](https://chrome.google.com/webstore/detail/cjpalhdlnbpafiamejdnhcphjbkeiagm), the [Opera store](https://addons.opera.com/en-gb/extensions/details/ublock/), or [manually](https://github.com/gorhill/uBlock/tree/master/dist#install).
Install µBlock from the [Chrome store](https://chrome.google.com/webstore/detail/cjpalhdlnbpafiamejdnhcphjbkeiagm), the [Opera store](https://addons.opera.com/en-gb/extensions/details/ublock/), or [manually](https://github.com/gorhill/uBlock/tree/master/dist#install).
To benefit from the higher efficiency, it is of course not advised to use an
inefficient blocker at the same time. µBlock will do as well or better than the
popular blockers out there.
Feel free to read [about the extension's required permissions](https://github.com/gorhill/uBlock/wiki/About-the-required-permissions).
Also of interest: [About the required permissions](https://github.com/gorhill/uBlock/wiki/About-the-required-permissions).
**Note:**
To benefit from µBlock's higher efficiency, it's advised that you don't use other inefficient blockers at the same time (such as AdBlock or Adblock Plus). µBlock will do [as well or better](#blocking) than most popular ad blockers.
## Release History
See the [releases pages](https://github.com/gorhill/uBlock/releases) for a history of releases and highlights for each release.
## Documentation
I think it is pretty obvious, except for this I suppose:
µBlock's functionality is self-explanatory and intuitive for the most part. One thing to note after you get started is the big power button in µBlock's popup:
![Popup](https://raw.githubusercontent.com/gorhill/uBlock/master/doc/img/popup-1.png)
The big power button is to disable/enable µBlock **for the specific hostname which can be extracted from the URL address of the current page**. (It applies to the current web site only, it is **not** a global power button.) The state of the power switch for a specific site will be remembered.
The big power button is to disable/enable µBlock for the specific current site/hostname (as extracted from the URL of the current page).
![Popup](https://raw.githubusercontent.com/gorhill/uBlock/master/doc/img/popup-2.png)
**In other words, it applies to the current site only; it is *not* a global power button.** The state of the power switch for a specific site will be remembered.
Optional [dynamic filtering](https://github.com/gorhill/uBlock/wiki/Dynamic-filtering:-quick-guide) at work.
For advanced usage, read about [dynamic filtering](https://github.com/gorhill/uBlock/wiki/Dynamic-filtering:-quick-guide) and more on [µBlock's wiki](https://github.com/gorhill/uBlock/wiki).
## About
µBlock is born out of [HTTP Switchboard](https://github.com/gorhill/httpswitchboard).
All the niceties of HTTPSB have been removed, and what is left is a straightforward
blocker which support EasyList and the likes, and also support host files.
Cosmetic filters ("element hiding") are supported.
There is nothing more to it. But it does what popular blockers out there do, at a
fraction of CPU and memory usage for the same blocking power. Also, no unique user id
and no home means no phoning home (some popular blockers do this, just be careful).
Free. Open source. For users by users. No donations sought.
Without the preset lists of filters, this extension is nothing. So if ever you
@ -77,9 +93,8 @@ really do want to contribute something, think about the people working hard
to maintain the filter lists you are using, which were made available to use by
all for free.
You may contribute by helping to translate this project. I created an
[entry on Crowdin](https://crowdin.net/project/ublock), where you may contribute
to the translation work.
You can contribute by helping to translate this project. There's an
[entry on Crowdin](https://crowdin.net/project/ublock) where you may contribute to µBlock's localization.
## License