When comparing uBlock Origin (as a Firefox addon) vs DNS66, the Slant community recommends DNS66 for most people. In the question“What are the best ad blockers for Android?” DNS66 is ranked 3rd while uBlock Origin (as a Firefox addon) is ranked 4th. The most important reason people chose DNS66 is:
By using a local VPN, the app doesn't need root privileges to function.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Fastest loading times
Pro Promised to remain commercial interest free
uBlock will remain free from any commercial as stated by the creator. uBlock is meant to be strictly for the users and completely free.
Pro No root access required
By using a local VPN, the app doesn't need root privileges to function.
Pro Open Source
The app is available on the F-Droid open source app repository.
Pro Global ad-blocking
Ads are blocked in every app, and apps can be whitelisted.
Cons
Con Doesn't block background ads yet
Ads that replace the background image of a website are currently beyond the scope of the ad-blocker, but the functionality is planned to be added in the future.
Con Standby battery drain
The app can use unreasonable amounts of battery charge when the phone is locked and not in use.
Con Unstable
app might crash on longer usage and cause looping which need to be restarted especially when there is internet changes on android