Big fan of Session Buddy <a href="https://chrome.google.com/webstore/detail/session-buddy/edacconmaakjimmfgnblocblbcdcpbko" rel="nofollow noreferrer">https://chrome.google.com/webstore/detail/session-buddy/edac...</a>
Far from perfect but ok in Firefox <a href="https://addons.mozilla.org/en-US/firefox/addon/tab-session-manager/" rel="nofollow noreferrer">https://addons.mozilla.org/en-US/firefox/addon/tab-session-m...</a>