User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.1 Build ID: 20120614114901 Steps to reproduce: One time i has updated Firefox and after this step i seen this trouble. Actual results: It doesn`t restore opened tabs. Expected results: It must restore previous tabs.
Not much information in your report. Do you read http://support.mozilla.org/en-US/kb/restore-previous-session ?
I`m so sorry, it was selected checkbox "Clear history on exit" in my settings.