I'm not talking about terms in the search results; I'm talking about terms in the search string in the search bar in the upper right corner. (Mine is set to use only Google.) When I've searched on a string and decide to modify the string for a second search (say, changing "Spanish architecture" to "Spanish architectural style"), clicking at the end of the search string first highlights the entire string and then, as I keep clicking, highlights various parts of the string. Sometimes it takes five clicks to get the highlighting to go away so I can start back-deleting normally instead of by entire word or phrase. The Google homepage doesn't do this, whereas all search engines in Firefox do it, so it's clearly a Firefox annoyance.