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Code Issues Releases Wiki Activity

Updated uBlock Origin works best on Firefox (markdown)

Raymond Hill 2020-12-31 14:52:54 -05:00
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uBlock-Origin-works-best-on-Firefox.md

@ -2,25 +2,33 @@ This document explains why uBO works best in Firefox.
### CNAME-uncloaking ### CNAME-uncloaking
Ability to uncloak 3rd-party servers disguised as 1st-party through the use of [CNAME record](https://en.wikipedia.org/wiki/CNAME_record). The effect of this is to make uBO on Firefox the most efficient at blocking 3rd-party trackers relative to other other blocker-browser pairs: Ability to uncloak 3rd-party servers disguised as 1st-party through the use of [CNAME record](https://en.wikipedia.org/wiki/CNAME_record). The effect of this is to make uBO on Firefox the most efficient at blocking 3rd-party trackers relative to other other browser/blocker pairs:
![c](https://user-images.githubusercontent.com/585534/103416937-b623c400-4b56-11eb-8e94-b4851a2248b7.png) ![c](https://user-images.githubusercontent.com/585534/103416937-b623c400-4b56-11eb-8e94-b4851a2248b7.png)
<br>The dark green/red bars are uBO before/after it gained ability to uncloak CNAMEs on Firefox.<br>Source: [_"Characterizing CNAME Cloaking-Based Tracking <br>The dark green/red bars are uBO before/after it gained ability to uncloak CNAMEs on Firefox.<br>Source: [_"Characterizing CNAME Cloaking-Based Tracking
on the Web"_](https://blog.apnic.net/2020/08/04/characterizing-cname-cloaking-based-tracking/) by [Asia Pacific Network Information Centre](https://www.apnic.net/about-apnic/) on the Web"_](https://blog.apnic.net/2020/08/04/characterizing-cname-cloaking-based-tracking/) at [Asia Pacific Network Information Centre](https://www.apnic.net/about-apnic/)
### HTML filtering ### HTML filtering
[HTML filtering](https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#html-filters) is the ability to the filter response body of HTML documents before it's parsed by the browser. [HTML filtering](https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#html-filters) is the ability to filter the response body of HTML documents _before_ it is parsed by the browser.
For example, this allows removing specific tags in HTML documents before they are parsed and executed by the browser, something not possible in a reliable manner in other browsers. This feature requires the [`webRequest.filterResponseData()`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/filterResponseData) API, currently only available in Firefox. For example, this allows the removal of specific tags in HTML documents before they are parsed and executed by the browser, something not possible in a reliable manner in other browsers. This feature requires the [`webRequest.filterResponseData()`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/filterResponseData) API, currently only available in Firefox.
### Browser launch ### Browser launch
At browser launch, Firefox will wait for uBO to be up and ready before network requests are fired in already opened tab(s). This is not the case with Chromium-based browsers, i.e. tracker/advertisement payloads may find their way into already opened tabs in Chromium-based browsers, while these are properly filtered in Firefox. Reliably blocking at browser launch is especially important for whoever uses default-deny mode of blocking. At browser launch, Firefox will wait for uBO to be up and ready before network requests are fired from already opened tab(s).
This is not the case with Chromium-based browsers, i.e. tracker/advertisement payloads may find their way into already opened tabs before uBO is up and ready in Chromium-based browsers, while these are properly filtered in Firefox.
Reliably blocking at browser launch is especially important for whoever uses default-deny mode for 3rd-party resources and/or JavaScript.
### Pre-fetching ### Pre-fetching
Pre-fetching, which is disabled by default in uBO, is reliably disabled in Firefox, while this is not the case in Chromium-based browsers. Chromium-based browsers give precedence websites over user settings when it comes to decide whether pre-fetching is disabled or not. See [documentation for _"Disable pre-fetching"_ ](https://github.com/gorhill/uBlock/wiki/Dashboard:-Settings#disable-pre-fetching). Pre-fetching, which is disabled by default in uBO, is reliably prevented in Firefox, while this is not the case in Chromium-based browsers.
Chromium-based browsers give precedence to websites over user settings when it comes to decide whether pre-fetching is disabled or not.
See [documentation for _"Disable pre-fetching"_ ](https://github.com/gorhill/uBlock/wiki/Dashboard:-Settings#disable-pre-fetching).
### WebAssembly ### WebAssembly
@ -28,4 +36,4 @@ The Firefox version of uBO makes use of WebAssembly code for core filtering code
### Storage compression ### Storage compression
The Firefox version of uBO can use LZ4 compression to store raw filter lists, compiled list data, and memory snapshots to disk storage. The Firefox version of uBO use LZ4 compression by default to store raw filter lists, compiled list data, and memory snapshots to disk storage.