Version 13.5 fixed a bug in the image scaling functionality and renamed the image scaling options to clarify their meaning.

The default settings for the image scaling options are:
(1) Enable fit-to-window scaling for all images - enabled
(2) Apply fit-to-window scaling when image loaded - disabled

If you change these settings, the changes will be remembered when you install new versions of Zoom Page WE.

Firefox's built-in image scaling allows large images to be shrunk to fit the window size. Zoom Page WE extends image scaling so that small images can be expanded to fit the window size, either by the user clicking on the image or automatically when the image is loaded.

Option (1) enables this extended image scaling functionality. Option (2) automatically expands a small images to fit the window size when the image is loaded. So you probably want Option (1) enabled and Option (2) disabled.

You can download old versions of Zoom Page WE from here: https://addons.mozilla.org/en-US/firefox/addon/zoom-page-we/versions/