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uBlock is not an ad blocker; it's a general-purpose blocker. uBlock blocks ads through its support of the Adblock Plus filter syntax. uBlock extends the syntax and is designed to work with custom rules and filters. That said, it's important to note that using a blocker is NOT theft. Don't fall for this creepy idea. The ultimate logical consequence of blocking = theft is the criminalisation of the inalienable right to privacy. µBlock is an accessible and user-friendly browser extension created to provide you with a simple method of blocking adverts and banners on the web pages you visit, while also enabling you to manually select other items you wish to stop from being displayed. µBlock allows you to import or create your own filters and rules from scratch, as well as build a whitelist, thus ensuring you fully decide when and what should be displayed on the websites you visit.

EasyList, Peter Lowe's Adservers, EasyPrivacy and Malware domains are enabled by default when you install uBlock. Many more lists are readily available to block trackers, analytics, and more. Hosts files are also supported. Once you install uBlock, you may easily un-select any of the pre-selected filter lists if you think uBlock blocks too much. For reference, Adblock Plus installs with only EasyList enabled by default.

Out of the box, these lists of filters are loaded and enforced:
- EasyList
- Peter Lowe’s Ad server list
- EasyPrivacy
- Malware domains
- Long-lived malware domains
- Malware Domains List
More lists are available for you to select if you wish:
- Fanboy’s Enhanced Tracking List
- Dan Pollock’s hosts file
- hpHosts’s Ad and tracking servers
- MVPS HOSTS
- Spam404
- And many others