system
4
If you’ve gone to Add-ons and clicked Plugins in the left pane, but don’t see Avast listed on the right, then…
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Close all browsers.
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Go to Control Panel → Programs and Features and select Avast. Click Uninstall/Change. Select Change in the window that comes up and click next. Uncheck the Browser Security feature, and click next.
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When that’s finished, change it again, checking the Browser Security feature to install it again.