What I did was this:
Start Sigil.
Place the cursor in between the paragraph tags.
Using the mouse, select Insert -> File from the menu.
Click on the Other Files button.
Paste the URL into the field at the bottom of the Add Existing Files window.
After about 5 seconds a popup occurs: Sigil has encountered a problem and may need to close.
Click on show details button.
Click on close button.
Sigil crashes.
It's repeatable. Doing add cover in the same fashion also leads to a crash as well. Reading a local file with a path like C:\Users\Mark\Pictures\foo.jpg loads as normal.
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