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jaydear, Boxy SVG work best with Edge as it then allows off-line use.
I use FF occasionally so I never hit the halt until i had read through the available info.
I work mainly with Vivaldi and less...

onlye, you still have some web content interest so the recent inclusion of Webp, SVG handling and improved PDF probably all have a breaking.

If I were in your shoes but had the chance of website...