Takes way too long on startup. Adds at least 5 seconds when launching browser, even if ublock is disabled for that site.

EN : The best and fastest and lightest Ad Blocker I have tried. (Much better than Ad Block Plus which lets advertisers pay to be unblocked)

FR : Le meilleur bloqueur de pubs, le plus rapide et léger. Meilleur qu'Ad Block Plus qui laisse passer les pubs des annonceurs qui le paient...

il est cool

wtf

Начал пропускать много рекламы. Что случилось?

Perfect for the users, for whom uMatrix is too complex or granular.

5 stars even though:
- it constantly loses some settings (such as advanced mode and cloud support) upon restart; a button to „show advanced mode panel“ would be a nice workaround and addition: really, for most users it is only needed occasionally;
– I'd like to have more control of cloud account – for transferring between browsers, e.g., or privacy issues (where are the settings stored? how the profiles are identified on the backend – this feature sorta breaks the presumption of full control over the web and tracking);
– I'd like to have an option to define my own script surrogates: many sites may be fixed just by defining a mock object such as Gemius={ player: { play: ()->undefined, stop: ()->undefined, ...}, init: ()->Gemius };
– it duplicates and, to some extent, clashes with Firefox'es internal tracker protection and such innocent extensions as DuckDuck privacy extension or ToS;DR which use the same default tracker lists; it would be very nice if uBO respected the settings of Firefox itself: if I whitelist a site in the default tracker, I'd like that those exceptions also propagated to uBO;
– the UI is absolutely counterintuitive;
– I feel it interferes with with GreaseMonkey clones and bookmarklets, but haven't done any in-depth research: on the contrary, I feel it would be nice if one could define someSite<->javascript: CSP rules in uBO.

And in general, uBO has a huge codebase of near-perfect request interception and redirection. It has a huge potential for geeks if there was some point to attach callbacks. For example: intercept and redirect .doc files to Viewer.js or Google Docs if content-type matches and it does not come from Google Docs :)