Not sure if this would work. Have you tried the Applications settings to open files by Photos?
Settings > Type "Applications" in search and associate JPEG to Photos app/default MAC App for pictures
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Not sure if this would work. Have you tried the Applications settings to open files by Photos?
Settings > Type "Applications" in search and associate JPEG to Photos app/default MAC App for pictures
The applications box doesn't have a row for images.
I found this, try and see if it works: https://addons.mozilla.org/en-US/firefox/addon/external-application/