[quote]Is there anyone with experiences in this and how to solve it?
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I just had a quick look at the plugin itself, and this is the native Firefox behaviour, for the ‘InsertHorizontalRule’ action. Many of the plugins use the browser’s native functionality to perform operations in the WYSIWYG, and the difference between results between IE and Firefox, is the fact that each browser implements the call differently.
This change would require handling the button press using the code, rather than passing the call to the browser. Not a huge change, but if you wish this to be looked at, the ebst course of action would be to submit a feature request in the Matrix Bug Tracker.