After you bookmark a page, you have the option of adding "tags" to the bookmark. A tag is a label that helps you identify a bookmark you've made. These tags are used to help better categorize bookmarks so you can find them in both your menu and when searching.
After you bookmark a page, clicking the star for a second time will open the Edit This Bookmark panel. For methods on how to add a new bookmark, see How do I bookmark a page?.
When you first bookmark a page, the Page Bookmarked panel will open.
For methods on how to add a new bookmark, see How do I bookmark a page?.
The Tags field lets you enter a list of tags you want associated with the new bookmark. When using more than one tag, use a comma to separate them.
For example, let's say you've bookmarked the page http://www.amazon.com. You might want to tag that bookmark with shopping, books, and gifts.
Clicking the star for a second time will open the Edit This Bookmark panel.
You can also add tags you have previously used by clicking on the down arrow next to the Tags field. Put a check mark next to each tag you want to add to the bookmark.
If you want to add or change tags for an existing bookmark, you can do so in one of two ways.
To change tags using the bookmark star:
To change tags using the Library window:
Tags are most useful when used with the Awesome Bar feature. When you type something into the Location bar, the autocomplete results will include items that match tags. For example, if you've tagged http://www.amazon.com with shopping, books, and gifts, you can type all or part of each tag name. The Location bar will include the tagged bookmarks in its autocomplete results.
For more information see the Awesome Bar - Search your Firefox bookmarks, history and tabs from the address bar article.
You can think of a tag as a "virtual" bookmark folder. Unlike regular bookmark folders, a bookmark can be in multiple virtual folders. To access your tags in the Library: