A Service Worker installs/updates and refreshes the page. It then intercepts "sw-image.svg" img URLs and dynamicaly responds with a static base64 image using the methods below. A bug occurs when in Firefox 59 when URLs contain a fragment value and SW responds with new Response() constructor

respondWith() fetch()

sw-image.svg?fetch1

sw-image.svg?fetch2#

sw-image.svg?fetch3#value

respondWith() new Response(blob)

sw-image.svg?blob-response1

sw-image.svg?blob-response2#

sw-image.svg?blob-response3#value

respondWith() new Response(new ReadableStream())

sw-image.svg?stream-response1

sw-image.svg?stream-response2#

sw-image.svg?stream-response3#value