Rated 5 out of 5 stars
I haven't had much chance to use this addon yet, but the reason I installed it was because crazy innapropriate ads were showing up on facebook, and were not facebook ads. so there was no way to report/remove them.
After installing flashblock they all disappeared. they were such a nuissance. I believe they started showing up after i installed free software. so i'm very thankful this addon took care of that problem.