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Welcome to Firefox Add-ons.
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About this Add-on
In computing, a plug-in is a software component that adds a specific feature to an existing computer program like Firefox.
Source & more information: https://en.m.wikipedia.org/wiki/Plug-in_(computing)
Often used plugins:
* Adobe Flash
* Adobe Acrobat
* Adobe ShockWave-Player
* Microsoft Silverlight
* Microsoft Office