tinymce tools bar does not extend the entire width of the textarea. In prior versions of Firefox it does (and also all other browsers) User tries to click on text within textarea that is to the right of the end of the tinymce tool area and tinymce ignores click (can't move cursor beyond the shortened toolbar position) Note: tinymce tool area is the row above the textarea and since it is rendered as SMALLER (less wide) than the text in the textarea, it appears that tinymce javascript handler doesn't see the text that extends beyond the area of the tools.