User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040616 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040616 i very often, by mistake, clicked on "close other tabs" and not on "close tab". i think that current place of "close other tabs" is wrong. it should be placed lower. Reproducible: Sometimes Steps to Reproduce: 1. fast click on close tab.
See also bug 191578, which is fixed in Mozilla 1.8 Alpha1. A similar feature is planned for Firefox (see bug 242844). *** This bug has been marked as a duplicate of 103354 ***