[Jasper_]

It currently breaks in Firefox private mode because I use the Cache APIs to try and prevent downloading the same file more than once, but Firefox disables the Cache APIs in private mode in a way I can't easily detect up-front. I'd love suggestions for a workaround or fix.

https://developer.mozilla.org/en-US/docs/Web/API/Cache

[maggit]

Ah! That's what got me. Private mode is my default. I can confirm that I get it working in Firefox outside of private mode. Thanks :)