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Thanks for that. Unfortunately I don’t have experience with Mac’s, but it may help someone else reading this that does.
You say you are using version 8.0. I guess for personal reasons you have opted not to update to the current version 9 (2014)
I’m don’t know whether Mac’s suffer the same problems as some Windows PC’s do when program updates are done over the top of existing versions, but you could try first a repair, and if that doesn’t fix the problem, a completely new install.
You could also try disabling the Avast AOS Firefox extension, and see if that makes any difference.