My current version of Firefox is 28.0. What I already know is: - that bookmark backup files (JSON) are stored in folder "...\Mozilla\Firefox\Profiles\<xxxxx>.default\bookmarkbackups in files like e.g. bookmarks-2014-04-27_770.json (or in any other place when you backup manually). - that bookmark export files are stored in any place as HTML (XML) in the Netscape bookmark format on your request to export. - the main difference between these two formats is that in the HTML export file ONLY BOOKMARKS (URLs / URIs) and NO TAGS are stored. - the JSON backup file stores bookmarks (URIs), tags and the complete tree structure. So Firefox is able to reconstruct the complete bookmark menu with all its information. I am doing a lot of info research in the internet. To support a sophisticated work with hundreds or even thousands of collected boomarks tags are absolutely necessary. And I have often export bookmarks with tags to other browsers or social bookmark sites. So I have no idea why firefox does not support tags in export files - since a large amount of bookmarks without tags is not manageable. My idea is to program a tool or an extension that reads a JSON backup file and constructs a HTML export file which also contains tags. The problem is that the internal structure of the JSON backup file is rather complex. Actually it contains "id", "index", "parent" information (all numeric) which makes it possible to reconstruct the original tree structure. Even information on tags is somehow linked to the bookmarks. Actually the file has a complicated structure of lists and trees. And don't think that there are any identifier, e.g. "tags" which precedes a list of tags attached to a bookmark (like in HTML exports). Actually I could identify some of my tags in the file, but they are not named e.g. with "tag" - I could identify them because I knew that they are some of my defined tags, but a program doesn't have this information and needs a general way to identify tags in the file. Currently I don't know any way to do this! Is there anybody who has a better understanding of the structur of this file or know a specification that could be find somewhere? So many thans in advance ...

{
 'title': 'Tags',
 'type': 'text/x-moz-place-container',
 'root': 'tagsFolder',
 'children': [
   {
    'title': '<tag title>',
    'id': <tag id>,
    'type': 'text/x-moz-place-container',
    'children': [
      {
       'title': '',
       'id': <id of child>,
       'parent': <parent id>,
       'type': 'text/x-moz-place',
       'uri': 'http://',
       'charset': 'UTF-8'
      },{ <more children> }
     ]
   },{ <more children> }
  ]
},