On 64-bit Windows, 32-bit Firefox add-ons will be installed to the folder C:\Program Files (x86)\Mozilla Firefox\browser\features. On Windows, system add-ons are located in the folder C:\Program Files\Mozilla Firefox\browser\features. However, it is not clear or obvious how to do that so let me show you. If you have no use for Firefox Hello, you might want to disable it. This change should come to the stable channel of Firefox with version 45. Mozilla has made Firefox Hello, its WebRTC-based communication feature as a system addon.
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