All those extensions are used for development of chrome and content code.
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Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly.
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Useful tools for the nightly tester.
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A suite of tools for developers.
A simple tool to trigger some of the background timers.
Collections are groups of related add-ons that anyone can create and share.Explore Collections