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Unable to install any addons after updating to Firefox 7.0.1

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I am not able to install any addons after updating to firefox 7.0.1. Addons are still working. Addons will start to download but will get stuck at 100% download progress.

I am not able to install any addons after updating to firefox 7.0.1. Addons are still working. Addons will start to download but will get stuck at 100% download progress.

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What addons do you already have installed? Could be one of them is interfering with the downloads somehow...