https://addons.mozilla.org/en-US/firefox/addon/tab-utilities/?src=search

If I bookmark "chrome://browser/content/places/places.xul" Then when used that opens the bookmarks library as a tab or window, rather than opening the standard library manager. Is that part of what you are trying to achieve ?

As a general change Firefox is moving towards having things open as tabs rather than separate entities.

I am not sure what exactly are you trying to do but maybe my idea helps.

See also [/questions/932236]

Thank you John99, it is what I am trying to do, but why it can not be a standard feature? In google chrome History Manager and Bookmarks Manager does opens in tab only and not in separate window also some suggestion that if such type of tabs have different colour these can be identified immediately.

Hi raju02,

Glad the answers helped you.

On this support forum we try to provide answers to questions, but do not deal with Requests For Enhancement. Developers are unlikely to see these posts. If you wish to make suggestions it is probably easiest from the Feedback button on Firefox, or the link http://input.mozilla.org/en-US/feedback

Note bookmarks may also be opened in a sidebar, use Ctrl + B, (on Windows) or the menu. See also

• Keyboard shortcuts - Perform common Firefox tasks quickly_bookmarks
• Use bookmark folders to organize your bookmarks