To edit a browser action, double click the browser action in the Clip Editor to open the Browser Action Editor.
The Browser Action Editor will appear in the lower panel properties pane. Alternately, you can expand the node in List view to access browser action details.
The Browser Action Editor can be made larger by clicking on the button in the lower right-hand corner of the toolbar.
The parameters of the selected browser action can be edited in the middle of the pane of the Browser Action Editor.