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Firefox>Tools>Add-on

references these three items:

  • add-on
  • extension
  • plugin

What are they and what is the relationship or differences between them?

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up vote 3 down vote accepted

It appears to me that both extensions and plugins are add-ons. Extensions add functionality to Firefox, whereas plugins are more about letting you play additional types of media (like silverlight, flash, quicktime).

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This is confirmed here: developer.mozilla.org/en/Extensions – Snark Feb 26 '10 at 4:11

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