uBO is the main reason I use Firefox on Android, as well. With that said, what sites are you visiting? It could be that I simply don't visit sites with any ads

uBO is the main reason I use Firefox on Android, as well. With that said, what sites are you visiting? It could be that I simply don't visit sites with any ads, but I gave a few of my daily sites a spin in Firefox Preview and didn't notice any ads.