Safari Extension - ZoomBySite - Set and remember zoom levels for individual web sites

This method initially worked OK but I found some problems with it.  For example, when composing a new email via gmail I could not see the "Send" button.  No good!

So I turned that off and am trying this extension instead: ZoomBySite

ZoomBySite is a Safari extension that:

1 - Lets you set a default zoom level for all sites

2 - Remembers a customized zoom level for specific sites