This extension makes it easy to adjust the viewBox of the document, which determines what part of the document is visible when viewed in a browser.
Download:
inkscape-viewbox-0.1.0.zip
Installation:
Simply unzip the downloaded file into the following directory:
C:\Program Files\Inkscape\share\extensions/usr/share/inkscape/extensions (system-wide
install) or ~/.config/inkscape/extensions
(single-user install)/Applications/Inkscape.app/Contents/Resources/extensions
Usage:
Draw a rectangle to mark the region to use as the new viewBox,
then run the extension from the menu
(Extensions > Web > Set viewBox).