Is uBlock Origin Safe? — Extension Safety Profile

uBlock Origin is a widely trusted content blocker that requests extensive permissions to function as intended. Its access to and webRequest/webRequestBlocking allows it to inspect and modify all network requests and page content, which is necessary to block ads, trackers, and malicious elements across any website you visit. The ability to read and alter data on file:// URLs and specific filter list domains supports local configurations and automatic updates of blocking rules. This scope is normal for a high-performance ad blocker, though it means the extension technically has the capability to see everything you browse.

For ad and content blockers, a typical safety consideration is that they operate with deep access to your web traffic. A careful user should ensure they install such tools from trusted developers and official stores, as malicious clones could abuse these permissions to intercept sensitive data. Users should also be aware that some sites may break or behave unexpectedly when content is blocked, which is a normal trade-off rather than a security flaw.

In this fact sheet, the strongest dimension is Community Reputation, reflecting the extension’s long-standing, positive track record among millions of users and high ratings. The weakest dimension is Data & Privacy, which likely reflects the inherent tension between its powerful access and the limited privacy policy transparency, though this is not unusual for a tool that must process all network requests locally to function without remote servers.