I don't think it has one natively. Which one do you mean? Or are you referring to tracking protection (private mode only, but available in Fx 49 also in "normal" mode iirc)
Yeah, I'm referring to Tracking Protection. It's not supposed to be an ad-blocker, but with almost all ads using tracking code, you rarely encounter ads when it's enabled.
It's probably even better for battery life than just an ad-blocker, as a lot of webpages also execute tracking code which isn't bound to ads.
And you could always enable it in normal browsing by setting "privacy.trackingprotection.enabled" in about:config to true...
I don't think it has one natively. Which one do you mean? Or are you referring to tracking protection (private mode only, but available in Fx 49 also in "normal" mode iirc)