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Firefox on macOS changes default apps for viewing / editing image files

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Firefox on macOS changes default apps for viewing / editing image files when dragged to the deskop / Finder.

When I drag an image from Firefox to the desktop the default application for viewing/editing that image file (JPG) changes to Preview. I tried Chrome and Safari too and then the default app for JPG files stays the same (Photoshop in my case).

It is easy to reproduce: change default app for JPG to Photoshop (⌘+i and Change All...). Drag an image form FF to desktop and it reverts back to Preview. So my guess this is really a Firefox bug.

macOS 10.13.4 / Firefox 59.0.2

Firefox on macOS changes default apps for viewing / editing image files when dragged to the deskop / Finder. When I drag an image from Firefox to the desktop the default application for viewing/editing that image file (JPG) changes to Preview. I tried Chrome and Safari too and then the default app for JPG files stays the same (Photoshop in my case). It is easy to reproduce: change default app for JPG to Photoshop (⌘+i and Change All...). Drag an image form FF to desktop and it reverts back to Preview. So my guess this is really a Firefox bug. macOS 10.13.4 / Firefox 59.0.2