Brave Components

Overview

Component extensions (or, more simply, components) allow Brave to receive asynchronous updates to core functionality without needing to update Brave itself. Currently, Brave uses components to download the data files associated with Ad Block, HTTPS Everywhere, Tracking Protection, Tor Client Updater and Widevine Content Decryption Module and Crypto Wallets.

Installation and Updates

On startup, Brave installs its registered components via https://go-updater.brave.com/extensions. If already installed, Brave verifies that the components are up-to-date. Once installed/verified, Brave checks for new updates every 5 hours. The sponsored image components for NTP are checked for updates every 15 minutes (see kSIComponentUpdateCheckInterval here).

Performing an On-Demand Update Check

To perform an on-demand update check of your installed components, visit brave://components/ in Brave and press the appropriate "Check for update" button.

You can check the list of components installed in Brave Browser by navigating to brave://components:

Component	Supported By Brave	Component ID	What it does	Repo	Comments
Autofill States Data	No	AutofillStates	Contains a mapping of acronyms of state names in different countries to the full names. Helps ease autofilling of state data.
Brave Ad Block Updater	Yes	iodkpdagapdfkphljnddpjlldadblomo	Contains Brave's default adblock lists	https://github.com/brave/brave-core-crx-packager	Component ID "mined" to include the substring adblo
Brave Ad Block List Catalog	Yes	gkboaolpopklhgplhaaiboijnklogmbc	Enumerates all Brave's supported regional list components	https://github.com/brave/adblock-resources/tree/master/filter_lists/list_catalog.json
Brave Ad Block Resources Library	Yes	mfddibmblmbccpadfndgakiopmmhebop	Enumerates all Brave's default resource replacements and scriptlets for adblocking	https://github.com/brave/adblock-resources, https://github.com/brave/uBlock
Regional lists (e.g. Easylist-Cookie List - Filter Obtrusive Cookie Notices)	Yes	various	Contains any regional lists enabled in brave://settings/shields/filters	https://github.com/brave/adblock-resources/tree/master/filter_lists/list_catalog.json	See list_text_component fields for relevant component IDs
Brave HTTPS Everywhere Updater	Yes	oofiananboodjbbmdelgdommihjbkfag	Maintains the HTTPSEverywhere database which is used to upgrade insecure navigations to secure when the matching rules are found	https://github.com/brave/https-everywhere-builder
Brave Local Data Updater	Yes	afalakplffnnnlkncjhbmahjfjhmlkal	Used to update Greaselion scripts, etc.	https://github.com/brave/brave-site-specific-scripts
Brave SpeedReader Updater	Yes	jicbkmdloagakknpihibphagfckhjdih	Maintains data files to support Brave Speedreader	https://github.com/brave-experiments/SpeedReader
Brave Tor Client Updater	Yes	cldoidikboihgcjfkhdeidbpclkineef cpoalefficncklhjfpglfiplenlpccdb biahpgbdmdkfgndcmfiipgcebobojjkp	Contains the Brave Tor client required to support Tor windows	https://github.com/brave/tor_build_scripts/
Brave User Model Installer	Yes	kkjipiepeooghlclkedllogndmohhnhi	Maintains data files to support Brave Ads	https://github.com/brave/brave-core-crx-packager/blob/master/scripts/packageClientModelParameterComponent.js
Certificate Error Assistant	Yes	SSLErrorAssistant	Helps fix errors in misconfigured SSL certificates
CRLSet	Yes	CertificateRevocation	Maintains a list of websites with bad certificates so that users can be protected from harmful websites
Crowd Deny	Yes	Crowd Deny	Revokes all permissions for sites in the list
Federated Learning of Cohorts	No	Floc	Has data to support FLOC		This feature has significant privacy risks and should not be enabled in Brave
File Type Policies	Yes	FileTypePolicies	List of file extensions and how they are handled in download protection		This is used by Safe Browsing
Hyphenation	Yes	Hyphenation		Data that assists css-hyphens in chromium
Legacy TLS Deprecation Configuration	No	TLSDeprecationConfig		This component adds a whitelist of domains that can use deprecated TLS 1.0/1.1 components.	Not needed. We disable TLS 1.0/1.1 completely in Brave.
MEI Preload	Yes	MEIPreload	Used to pre-seed the Media Engagement Index which determines whether auto-play is enabled on a site	https://www.chromium.org/audio-video/autoplay/autoplay-pre-seeding-in-chrome
NTP Sponsored Images	Yes	gccbbckogglekeggclmmekihdgdpdgoe	Updates the NTP Sponsored image assets	https://github.com/brave/brave-core-crx-packager/blob/master/scripts/packageNTPSponsoredImagesComponents.js
NTP Super Referral	Yes		Updates the NTP Super Referral image assets	https://github.com/brave/brave-core-crx-packager/blob/master/scripts/packageNTPSuperReferrerComponent.js
NTP Super Referral mapping table	Yes		Manage NTP SR mapping table (promo code and NTP SR Component id	https://github.com/brave/brave-core-crx-packager/blob/master/scripts/packageNTPSuperReferrerMappingTableComponent.js
Origin Trials	No	OriginTrials	Metadata for origin trials
Safety Tips	Yes	SafetyTips	Protobuf of domains for client side lookalike URL detection
Subresource Filter Rules	No	Subresource Filter	Contains rules to block websites which don’t follow the better Ads Standard. Its often used to block phishing domains
Widevine	Yes	oimompecagnajdejgnnjijobebaeigek	Widevine’s DRM solution provides the capability to license, securely distribute and protect playback of content on any consumer device
youtubedown.js	Yes		Used to get playlist-component	https://github.com/brave/brave-core-crx-packager/blob/master/scripts/packageYoutubedown.js
Zxcvbn Data Dictionaries	No	ZxcvbnData	This contains the data like popular English words and names to higlight password strength.		The work to develop a custom password check is being tracked here: https://github.com/brave/brave-browser/issues/12001
Crypto Wallets	Yes	odbfpeeihdkbihmopkbjmoonfanlbfcl	Contains the Brave Crypto Wallet component required to support Dapp	http://github.com/brave/ethereum-remote-client/	Component lazy loads by default unless set to run at browser startup