I am trying to find out what will happen when a user had a side-loaded, fully-reviewed extension installed, and we update the extension files with a version that has not been fully reviewed yet, only preliminarily. Will the extension continue to work, or will Firefox refuse the new version and disable the extension?
As long as it’s signed I don’t think Firefox has any way to know the difference, but @jorgev would know better.
If the extension is being updated via an updateURL, it should work. If it’s updated through the side-loading method, it won’t work because only fully reviewed extensions can be installed that way.