Documentation
unique_urls
This option allows to generate unique urls from files based on their file size and their last modification date. This will help you bust the browser cache where it would normally cache every image.
Example of usage in TinyMCE
tinymce.init({
...,
moxiemanager_unique_urls: true
});
Example of usage in standalone mode
moxman.browse({
...
unique_urls: true
});