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Rated 3 out of 5 stars
In general I love this addon, but totday I had to turn it off because I managed to trace my Firefox stalls and 100% CPU core pegs to this addon.
I have no idea what exactly is going on, but the addon will cause a CPU core to continuously use 100% resources. Closing the tab will not solve anything since it seems the thread does not get ended. You have to restart Firefox completely.