Privacy Badger was just released, and I've only used it for a short while. So far I've had no problems, and it seems to work well. However, the Chrome version feels more complete than the Firefox version. For example, the Badger icon in Firefox doesn't show the number of tracking sites, but the Chrome version does. Also, the Chrome version identified more trackers on specific sites than the Firefox version.
Technically, Privacy Badger is still in beta, but it's stable and the EFF encourages everyone to download it. I expect the rough edges to be smoothed out quickly, and I don't see any reason not to use it. After all, there's little upside to being tracked.
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