Changes

These are tagged as [good first bug] in a bug's Whiteboard field. The challenge of a "good first bug" is only peripherally about the bug itself. The focus, for a new contributor, should be on getting your development environment set up and learning how to navigate Mozilla's contribution process. There are some [https://developer.mozilla.org/en-US/docs/Introduction excellent documents on MDN] to help you get started, and the #introduction IRC channel exists just to help people getting started as contributors.

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===Good Next Bugs===

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