v1.4.2

Changed

• Simplify window boundary queries (performance)
• Use constructors for all DOM elements, rather than populating the inner bits with innerHTML (this removes a validation warning for the extension, but also just feels better)
• Use the same Blob/URL for both sprites, instead of generating two different ones from the same source (memory/performance)
• Split library/extension build tasks
• Generate extension from a portable Docker to help Mozilla review team

Fixed

• Correct the browser extension's update feed URL