sesweitzer

And here's "Close Tabs to Right":  
   
 
// Close Safari tabs to the right of the active one. ObjC.import('stdlib') function run(argv) {   var count = 0,     safari = Application('Safari'),     win = safari.windows[0],     tabs = win.tabs,     currentIdx = win.currentTab.index();   // console.log('Tab ' + currentIdx + '/' + tabs.length + ' active.');   if (currentIdx == tabs.length) {     console.log('No tabs to close.')     return   }     var first = tabs.length - 1,     last = currentIdx;   for (i = first; i >= last; i--) {     // console.log('Closing tab ' + (i+1) + ' ...');     var tab = tabs[i];     tabs[i].close();     count++;   }   console.log(count + ' tab(s) closed'); }  
 

Put this in a Run Script Action with Language = /usr/bin/osascript (JS)
// Close Safari tabs to the left of the active one. ObjC.import('stdlib') function run(argv) { var count = 0, safari = Application('Safari'), win = safari.windows[0], tabs = win.tabs, currentIdx = win.currentTab.index(); if (currentIdx == 1) { console.log('No tabs to close.') return } // start at currentIdx - 2 due to 0-indexing in JS for (i = currentIdx - 2; i >= 0; i--) { var tab = tabs[i]; tabs[i].close(); count++; } console.log(count + ' tab(s) closed'); }