Yesterday I upgraded my Firefox browser to Quantum (version 57). I found some replacement addons to replace a couple of the ones Quantum disabled. Later in the day Avast Antivirus flagged two of them as having bad reputations and offered to remove them. I let Avast remove them, but all it seems to have done is removed them from the list of Extension on about:addons, the Firefox page where you add/remove/configure extensions. Is there another way to remove them?