question: Ad blockers are common for Computer applications, (Adblock+) Why is it uncommon to find working ad lockers for mobile phones?
comment: firefox on android supports plugins just like its desktop counterpart such as ublock origin. google chrome on android on the other hand does not have the same extension system as the desktop version
passages: On rooted devices, the Android app blocks ads on all web traffic including mobile networks. For non-rooted devices, ads are only blocked through a Wi-Fi connection and requires the user to set up a local proxy server for each network in order for the app to function. The app uses a local proxy server to intercept web traffic and remove ads before showing content to the user. Most of the content that users are trying to block will be removed, though some content is missed and the app is not as reliable at blocking ads as the browser versions. The app can be configured to auto-start every time the device reboots, minimizing the action required by the user.
   Adblock Plus was released as an app for Android devices in November 2012. On March 3, 2013, the Android app was removed from the Google Play Store along with similar ad-blocking apps. Some apps remain in the Play Store with the caveat that they require root access in order to function. Adblock Plus, while not in the Play Store, is still available on the app's website. Users can download the .apk file directly and install it as a third-party app if they allow "Unknown Sources" in Android settings. The application page as of December 2017 features the Adblock Browser for Android instead of the original app.
   Section::::Methods.:Recursive Local VPN.
  
  On Android, apps can run a local VPN connection with its own host filtering ability and DNS address without requiring root access. This approach allows adblocking app to download adblocking host files and use them to filter out ad networks throughout the device. Blokada, DNS66, AdGuard are few of the popular apps which accomplish adblocking without root permission. The adblocking is only active when the local VPN is turned on, and it completely stops when the VPN connection is disconnected. The convenience makes it easy to access content blocked by anti-adblock scripts.
   Like Mozilla's built-in image blocker, Adblock Plus blocks HTTP and HTTPS requests according to their source address and additional context information and can block iframes, scripts, and Flash. It also uses automatically generated user stylesheets to hide elements such as text ads on a page as they load instead of blocking them, known as element hiding.
  
  Section::::Operation.:Android.
   List of pop-up blocking software
  
  This is a list of software that blocks pop-up ads.
  
  Section::::Browsers that block pop-up ads.
  
  Trident shells
  
  BULLET::::- AOL Explorer
  
  BULLET::::- Avant Browser
  
  BULLET::::- GreenBrowser
  
  BULLET::::- Internet Explorer
  
  BULLET::::- Lunascape
  
  BULLET::::- Maxthon
  
  BULLET::::- MSN Explorer
  
  BULLET::::- NeoPlanet
  
  BULLET::::- Netcaptor
  
  BULLET::::- Netscape 8
  
  BULLET::::- Sleipnir
  
  BULLET::::- UltraBrowser
  
  BULLET::::- WebbIE
  
  Gecko-based browsers
  
  BULLET::::- Camino
  
  BULLET::::- Epiphany
  
  BULLET::::- Flock
  
  BULLET::::- Galeon
  
  BULLET::::- K-Meleon
  
  BULLET::::- Lunascape
  
  BULLET::::- Mozilla Application Suite
  
  BULLET::::- Mozilla Firefox
  
  BULLET::::- Netscape 7
  
  BULLET::::- Netscape 8
  
  BULLET::::- SeaMonkey
  
  KHTML/WebKit-based browsers
  
  BULLET::::- Google Chrome
  
  BULLET::::- Konqueror
  
  BULLET::::- iCab
  
  BULLET::::- Lunascape
  
  BULLET::::- OmniWeb
  
  BULLET::::- Shiira
  
  Presto-based browsers
   Advertising can be blocked by using a DNS server which is configured to block access to domains or hostnames which are known to serve ads by spoofing the address. Users can choose to use an already modified DNS server or set up a dedicated device such as a Raspberry Pi themselves. Manipulating DNS is a widely employed method to manipulate what the end user sees from the Internet but can also be deployed locally for personal purposes. China runs its own root DNS and the EU has considered the same. Google has required their Google Public DNS be used for some applications on its Android devices. Accordingly, DNS addresses / domains used for advertising may be extremely vulnerable to a broad form of ad substitution whereby a domain that serves ads is entirely swapped out with one serving more local ads to some subset of users. This is especially likely in countries, notably Russia, India and China, where advertisers often refuse to pay for clicks or page views. DNS-level blocking of domains for non-commercial reasons is already common in China.
   Starting with Adblock 0.4, in early 2003, the development of Adblock was taken over by "rue". This version used XBL to hide the ads and with this objects like Flash or Java could also be blocked. But as with the original version the ads were still able to be downloaded. This was a developer build and not a stable release as were subsequent further versions (either released as nightly or development builds) making Adblock 0.3 the last stable release.
   Another important aspect is improving security; online advertising subjects users to a higher risk of infecting their devices with computer viruses than surfing pornography websites. In a high-profile case, malware was distributed through advertisements provided to YouTube by a malicious customer of Google's Doubleclick. In August 2015, a 0-day exploit in the Firefox browser was discovered in an advertisement on a website. When Forbes required users to disable ad blocking before viewing their website, those users were immediately served with pop-under malware. The Australian Signals Directorate recommends individuals and organizations block advertisements to improve their information security posture and mitigate potential malvertising attacks and machine compromise. The information security firm Webroot also note employing ad blockers provide effective countermeasures against malvertising campaigns for less technically-sophisticated computer users.
   The ADN is most often deployed in the DMZ at the edge of the network. This results in exposure to potential network layer attacks including Denial of Service (DoS) from ICMP and SYN floods. As a result, the ADN must necessarily protect not only itself but the applications it is delivering from succumbing to such attacks. The ADN generally employs a number of protections against typical network layer attacks though it does not implement the full security offered by an IPS. Some of the Network Layer Security technologies that may be employed by ADN devices include:
   Call blockers and related services recently received attention in 2016 from publications including Which? and Consumer Reports in the United Kingdom and United States respectively. Such devices and services enable the user to block a call as it is in progress or alternatively block the number after the call is made. These devices rely on caller ID information and thus a phone blocker requires a caller ID service active on the line for blocking to function. 
   Section::::Popularity.
  
  Use of mobile and desktop ad blocking software designed to remove traditional advertising grew by 41% worldwide and by 48% in the U.S. between Q2 2014 and Q2 2015. As of Q2 2015, 45 million Americans were using ad blockers. In a survey research study released Q2 2016, MetaFacts reported 72 million Americans, 12.8 million adults in the UK, and 13.2 million adults in France were using ad blockers on their PCs, smartphones, or tablet computers. In March 2016, the Internet Advertising Bureau reported that UK adblocking was already at 22% among people over 18 years old.
  
  Section::::Methods.
   This approach optimizes battery usage, reduces internet slowdown caused by using external DNS or VPN adblocking and needs overall less configuration.
  
  Section::::Methods.:Hardware devices.
  
  Devices such as AdTrap use hardware to block Internet advertising. Based on reviews of AdTrap, this device uses a Linux Kernel running a version of PrivProxy to block ads from video streaming, music streaming, and any web browser. Another such solution is provided for network-level ad blocking for telcos by Israeli startup Shine.
  
  Section::::Methods.:By external parties and internet providers.
   Many websites rely on ads as a source of revenue, but the use of ad blockers is increasingly common. Websites that detect an adblocker in use often ask for it to be disabled - or their site to be "added to the whitelist" - a standard feature of most adblockers.
  
  Section::::LAN whitelists.
   BULLET::::- Adreno 330 inside the Nexus 5, Amazon Kindle HDX series tablets, Amazon Fire phone, Nokia Lumia 2520 tablet, Nokia Lumia 1520, Nokia Lumia Icon, Nokia Lumia 930, Samsung Galaxy S5, Samsung Galaxy Note 3, Sony Xperia Z1, Sony Xperia Z1 Compact, Sony Xperia Z2, Sony Xperia Z3, Sony Xperia Z3 Compact, Sony Xperia Z Ultra, Xiaomi Mi3, Xiaomi Mi4, OnePlus One, HTC One (M8) and LG G2/G3 smartphones.
   With the release of iOS 9, the Safari web browser allows for third-party content blocking apps. Safari also allows users to customize the appearance of the Reader mode, with options for font and background color.
  
  A few days after the release of iOS 9, ad blocking software had topped the App Store charts, with Marco Arment, developer of a Peace app, saying that "web advertising and behavioral tracking is out of control. ... They're unacceptably creepy, bloated, annoying, and insecure, and they're getting worse at an alarming pace."
  
  Section::::App features.:Wallet.
   Ad blocking, or ad filtering, means the ads do not appear to the user because the user uses technology to screen out ads. Many browsers block unsolicited pop-up ads by default. Other software programs or browser add-ons may also block the loading of ads, or block elements on a page with behaviors characteristic of ads (e.g. HTML autoplay of both audio and video). Approximately 9% of all online page views come from browsers with ad-blocking software installed, and some publishers have 40%+ of their visitors using ad-blockers.
  
  Section::::Concerns.:Technological variations.:Anti-targeting technologies.
   The original version of Adblock (0.1) was written as a side project for Firefox by Danish software developer Henrik Aasted Sorensen, a university student at the time, in 2002. It hid image ads through user-defined filters from the page but did not actually prevent them from being downloaded. Sorensen maintained the open source project until Adblock 0.3 after which the project changed hands. This was also the last stable release of Adblock.
   On September 16, 2015, Arment released Peace, a Safari content blocker for iOS 9 using the Ghostery database. After Peace had held the top spot on the App Store's list of paid apps for 36 hours, Arment pulled it from the App Store, stating he didn't "feel good" with its resounding success. He elaborated, "While [ad blockers] do benefit a ton of people in major ways, they also hurt some, including many who don't deserve the hit."
  
  Section::::External links.
  
  BULLET::::- Marco.org
  
  BULLET::::- Instapaper Founder Marco Arment On The App Economy, an interview with Marco Arment on NPR's Planet Money
   There are third-party extensions and plugins available to harden even the latest browsers, and some for older browsers and operating systems. Whitelist-based software such as NoScript can block JavaScript and Adobe Flash which is used for most attacks on privacy, allowing users to choose only sites they know are safe - AdBlock Plus also uses whitelist ad filtering rules subscriptions, though both the software itself and the filtering list maintainers have come under controversy for by-default allowing some sites to pass the pre-set filters. The US-CERT recommends to block Flash using NoScript.
  
  Section::::Fuzzing.
   Blocker
  
  A blocker is someone or something that blocks.
  
  Blocker may also refer to:
  
  Section::::Computing.
  
  BULLET::::- Ad blocker
  
  BULLET::::- Microphone blocker
  
  BULLET::::- Any type of content filter
  
  Section::::Medicine.
  
  BULLET::::- Receptor antagonists, such as an alpha blockers or beta blockers, that block molecular attachment
  
  BULLET::::- Alpha blockers, a class of vasoactive drugs
  
  BULLET::::- Angiotensin II receptor antagonists, a class of vasoactive drugs
  
  BULLET::::- Beta blockers, a class of vasoactive drugs
  
  BULLET::::- Channel blockers, blockers that block ion channels
  
  Section::::Sports.
  
  BULLET::::- Blocker (cricket), slang for a defensive-minded batsman in cricket
  
  BULLET::::- Blocker (ice hockey)
  
  BULLET::::- Blocker, a position in roller derby
   The Dana had an IRDA compatible infrared port for transferring documents and files. This was a convenient way to back up files for those who had access to multiple Danas.
  
  Section::::AlphaSmart products.:Dana.:Dana Wireless.
   In a security issue reported in March 2011, ADB was targeted as a vector to attempt to install a rootkit on connected phones using a "resource exhaustion attack".
  
  Section::::Official development tools.:Android SDK Platform Tools.:Fastboot.
   Ad blocking also reduces page load time and saves bandwidth for the users. Users who pay for total transferred bandwidth ("capped" or pay-for-usage connections) including most mobile users worldwide, have a direct financial benefit from filtering an ad before it is loaded. Analysis of the 200 most popular news sites (as ranked by Alexa) in 2015 showed that Mozilla Firefox Tracking Protection lead to 39% reduction in data usage and 44% median reduction in page load time. According to research performed by The New York Times, ad blockers reduced data consumption and sped up load time by more than half on 50 news sites, including their own. Journalists concluded that "visiting the home page of Boston.com (the site with most ad data in the study) every day for a month would cost the equivalent of about $9.50 in data usage just for the ads". Streaming audio and video, even if they are not presented to the user interface, can rapidly consume gigabytes of transfer especially on a faster 4G connection. Even fixed connections are often subject to usage limits, especially the faster connections (100Mbit/s and up) which can quickly saturate a network if filled by streaming media. 
   Network block device servers are typically implemented as a userspace program running on a general-purpose computer. All of the function specific to network block device servers can reside in a userspace process because the process communicates with the client via conventional sockets and accesses the storage via a conventional file system interface.
  
  The network block device client module is available on some Unix-like operating systems, including Linux and Bitrig. Since the server is a userspace program, it can potentially run on every Unix-like platform; for example, NBD's server part has been ported to Solaris.
  
  Section::::See also.
   Section::::Background.
  
  A microphone blocker is a cheap, simple accessory that provides protection against eavesdropping, cellphone surveillance, and other types of audio hacking. There are a variety of spyware programs that can turn on a mobile device's microphone remotely, and the vast majority of devices do not have internal hardware protection to prevent eavesdropping. Most anti-spying software does not guarantee that the microphone will be fully blocked or disabled, while spyware and malware are constantly changing and improving.
  
presuppositions: Ad blockers are uncommon for mobile phones.
corrections: Ad blockers are not uncommon on mobile phones.
raw_presuppositions: Ad blockers are uncommon for mobile phones. It is uncommon to find working ad blockers for mobile phones.
raw_corrections: Ad blockers are not uncommon on mobile phones. It is common to find working ad blockers for mobile phones such as firefox on android supporting plugins just like its desktop counterpart such as ublock origin.