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Where's firefox in the perf?

In the battery-benchmarks that I've seen so far, Firefox was always the leading browser, so granted those benchmarks did not test Opera's battery saving mode, Firefox should still be at least in second place.

And Firefox does also have a native ad-blocker, so if you enable that, too, I could imagine that it maybe even still outperforms Opera's battery saving mode, but yeah, a proper benchmark would be good...

> Firefox does also have a native ad-blocker

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...

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