The mouse right-click copy-paste menu often fails in Firefox 4. If I highlight something to copy and then use the mouse to right-click on it, the menu will appear down and to the right. Second, the highlighted command (i.e. copy, paste, etc) will be two steps beneath the mouse pointer. Third, if one chooses "copy" for example, your highlighted text might or might not (usually Not) be copied. This works as expected (perfectly) on this Firefox site, but fails on all other web pages. Note: This is a "company computer" where I am not an administrator.