Yes, uBlock Origin is safe. Just make sure you're getting it from a reliable source such as the Mozilla add-ons page or the Chrome web store .
Is using uBlock origin safe?
For Internet users who wish to remain safe from possible threats they may encounter while browsing the Web, uBlock Origin is one of those nifty apps that keeps them away from bad scripts or bad ads that may have affected legitimate sites they frequent.
Does uBlock origin steal data?
The uBlock extension captures anonymous usage information including the version number of the extension, preferred language, Acceptable Ads opt-in, number of blocked requests, number of ads blocked, and browser and operating system type. The uBlock extension also assigns an anonymous, unique ID to each installation.