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• Eyedropper

  ...Inspector > Default color unit: You can use it in one of two ways: to select a color from the page and copy it to the clipboard to change a color value in the Inspector’s Rules view to a color you’ve selected from the page Copying a col...

• Rich output
• Taking screenshots
• SimpleTest.promiseClipboardChange (JavaScript static function, in SimpleTest framework)
• UrlbarInput.sanitizeTextFromClipboard (JavaScript function, in UrlbarInput Reference)
• Building Firefox On Linux
• Building Firefox On macOS
• Building Firefox On Windows
• Console messages
• Contextual Feature Recommendation
• Debugging WebRTC Calls
• Examine and edit HTML
• Feature Callout