This plugin was created as a simple example about creating a combo element in the toolbar of CKEditor. It serves also as a little test of the new CSS Transforms feature available in new browsers (or the old zoom in IE)
After installing it you'll have a combo box to set the zoom on the edited content. The plugin is basic and not too polished but it can serve you if you want this feature or as a starting point for other plugins.
Further explanations at the post in my blog.
License
Licensed under the terms of any of the following licenses at your choice: GPL, LGPL and MPL.
Download
Zoom version 1.0:
download link
Installation
1. Extract the contents of the file into the "plugins" folder of CKEditor.
2. In the CKEditor configuration file (config.js) add the following code:
3. In your toolbar configuration, add a new 'Zoom' item in the place where you want the combo to show up.
After installing it you'll have a combo box to set the zoom on the edited content. The plugin is basic and not too polished but it can serve you if you want this feature or as a starting point for other plugins.
Further explanations at the post in my blog.
License
Licensed under the terms of any of the following licenses at your choice: GPL, LGPL and MPL.
Download
Zoom version 1.0:
download link
Installation
1. Extract the contents of the file into the "plugins" folder of CKEditor.
2. In the CKEditor configuration file (config.js) add the following code:
config.extraPlugins = 'zoom';
3. In your toolbar configuration, add a new 'Zoom' item in the place where you want the combo to show up.

http://cksource.com/forums/viewtopic.php?f=11&t=25748
thx
So you should find out exactly which browser have the bug and then file a ticket on each one based on a simplified testcase.