SVG Navigator by Peter Ryszkiewicz

SVG Navigator adds infinite zoom and panning to the SVG files you open in Firefox. SVGs are vector graphics that stay sharp at any size, so you can keep zooming into big maps, diagrams, and illustrations for as long as there is detail to see.

Open an SVG file and:
* Scroll to zoom in infinitely, or back out, at the pointer
* Drag to pan, or hold Space and move the pointer
* Drag a box around exactly the area you want to see (zoom box mode)
* Press Esc to reset the view, or Alt to zoom out
* Use the + / − / Reset toolbar in the corner of the page

Make it work your way from the toolbar button: choose whether click-and-drag pans or draws a zoom box, adjust scroll sensitivity or invert the scroll direction, show or auto-hide the zoom toolbar, and pick a background color for transparent SVGs.

SVG Navigator works on SVG files from any website, including ones served without a .svg file name. It leaves other pages alone, collects no data, and makes no network requests.

Free and open source: https://github.com/pRizz/SVG-Navigator---Chrome-Extension