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This add-on enhances Firefox's image viewer with scroll-to-zoom and drag-to-pan functionality.

Better Image Viewer adds the following actions:

Scroll up/keyboard plus: zoom in
Scroll down/keyboard minus: zoom out
Keyboard zero: zoom 1:1
Click: toggle between zoom-to-fit and 1:1
Drag: pan
Shift+drag: drag image (e.g. to another window)

You can also use a popup toolbar on the left-hand side of the window to control zoom.

Better Image Viewer is no longer maintained.