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I cannot get firefox to open, could security setting interfer? I use AVG

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On Wednesday 9/28 Comcast changed my modem and now I cannot get Firefox to open, when I click my mouse on the icon I get a brief hourglass and that quickly goes away and Firefox doesn't open.

On Wednesday 9/28 Comcast changed my modem and now I cannot get Firefox to open, when I click my mouse on the icon I get a brief hourglass and that quickly goes away and Firefox doesn't open.

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The extension(s) that AVG installs can certainly be a problem, disable "AVG Safe" for a temporary solution, but it is better to reinstall AVG without the Link Scanner component, and as always be vigilant in rejecting additional crapware, please review all of the following but particularly information concerning "AVG Safe".