Save Firefox Open Tabs to File (Browser Console script)

openTabsToBookmarksHTML.js

/* Current Session Open Tab List Exporter Script for the Browser Console

   BEFORE RUNNING THIS SCRIPT, CHECK THIS SETTING:
     Type or paste about:config into the address bar and press Enter
     Click the button promising to be careful
     In the search box type devt and pause while Firefox filters the list
     If devtools.chrome.enabled is false, double-click it to toggle to true

   TO RUN THIS SCRIPT:
    Paste this entire script into the command line at the bottom of the Browser Console (Windows: Ctrl+Shift+j)
    Then press Enter to run the script. A save dialog should promptly open.
*/
  try {
    var ssj = SessionStore.getBrowserState(); // get Current Session State
    var oSess = JSON.parse(ssj);
  } catch(err) {
    alert('Unable to retrieve session: ' + err);
  }
  if(oSess && Object.hasOwn(oSess, 'windows') && oSess.windows.length > 0){
    // Generate a string with the format of a bookmark export file
    var out = '<!DOCTYPE NETSCAPE-Bookmark-file-1>\n<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">\n<TITLE>Bookmarks</TITLE>\n<H1>Bookmarks Menu</H1>\n<DL><p>\n';
    const escapeHtmlEntities = function(aText){return (aText || '').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#39;')};
    for (var j=0; j<oSess.windows.length; j++){
      // Create a folder for each window
      out += '<DT><H3>Window ' + j + '</H3>\n<DL><p>\n';
      // List tabs
      for (var i=0; i<oSess.windows[j].tabs.length; i++){
        var currTab = oSess.windows[j].tabs[i];
        // Create a bookmark (link) for each tab
		if (currTab.entries[currTab.index - 1].url.indexOf('about:') < 0) {
          out += '  <DT><A HREF="' + currTab.entries[currTab.index - 1].url + '">' + escapeHtmlEntities(currTab.entries[currTab.index - 1].title) + '</A>\n';
		} else {
          out += '  <DT>' + escapeHtmlEntities(currTab.entries[currTab.index - 1].title) + ' {' + currTab.entries[currTab.index - 1].url + '}\n';
		}
      }
      out += '</DL><p>\n';
    }
    out += '</DL><p>\n</DL>';
    // Set up Save As dialog with proposed file name
    var fp = Components.classes["@mozilla.org/filepicker;1"].createInstance(Components.interfaces.nsIFilePicker);
    try { // Fx125+
      fp.init(window.browsingContext, 'Open File', Components.interfaces.nsIFilePicker.modeSave);
    } catch(e) { // Fx124 and earlier
      fp.init(window, 'Open File', Components.interfaces.nsIFilePicker.modeSave);
    }
    fp.appendFilter('HTML Files', '*.html');
    var d = new Date();
    d.setMinutes(d.getMinutes() - d.getTimezoneOffset());
    var dt = d.toISOString().split('.')[0].replace(/-/g, '').replace(/:/g, '').replace(/T/, '_');
    fp.defaultString = 'bookmarks-from-open-tabs_' + dt + '.html';
    // Call Save As dialog and (unless user cancels) write the file
    fp.open((aResult) => {
      if (aResult == Components.interfaces.nsIFilePicker.returnOK ||
        aResult == Components.interfaces.nsIFilePicker.returnReplace) {
        try {
          IOUtils.writeUTF8(fp.file.path, out);
          alert('Look for ' + fp.file.path);
        } catch (err) {
          alert(err);
        }
      } else {
        alert('Okay, not saving');
      }
    });
  } else {
    alert('No open windows found in the current session.');
  }