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Updated Does µBlock blocks ads or just hide them? (markdown)

Raymond Hill 2015-02-04 00:49:32 -05:00
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Does-µBlock-blocks-ads-or-just-hide-them?.md

@ -16,16 +16,22 @@ There are two kinds of [ABP-compatible filters](https://adblockplus.org/en/filte
The purpose of network filter is to prevent a network request to be made to a remote server, so as to prevent downloading a remote resource. µBlock will prevent the network request from even being made. This saves bandwidth, decrease privacy exposure -- as the remote server won't be able to log anything if you do not contact it.
**Answer:** resources blocked: network requests are cancelled before they leave the browser.
**Short answer:** resources blocked: network requests are cancelled before they leave the browser.
#### Cosmetic filters
These filters serve to remove DOM elements from a web page. They have no value privacy-wise, it is essentially to make web page look better by removing unwanted content, which usually cannot be blocked using network filters. Just like ABP, µBlock will hide DOM elements on a web page which match cosmetic filters. µBlock uses a [different method](https://github.com/gorhill/uBlock/wiki/Cosmetic-filtering-in-%C2%B5Block:-version-0.4.0.0-update) than other big-name blockers to hide the DOM elements though.
**Answer:** resources hidden.
Different classes of cosmetic filters are applied differently:
- Specific cosmetic filters: injected before page's root DOM is loaded
- Generic cosmetic filters: injected after page's root DOM is loaded
- Cached generic cosmetic filters: injected before page's root DOM is loaded
**Short answer:** resources hidden -- in various ways depending on the class of cosmetic filters.
#### Hosts file
µBlock also support the parsing and enforcing of hosts files -- something which ABP does not. All entries in a hosts file are parsed as network filters, i.e. no resource will be fetch from a remote server which appear in a hosts file, no connection will even be attempted.
**Answer:** resources blocked: network requests are cancelled before they leave the browser.
**Short answer:** resources blocked: network requests are cancelled before they leave the browser.