Bookmark Manager Firefox 115.2.9esr (64-bit)
Hi,
Like everyone else, I have thousands of bookmarks subdivided into folders. When you use 'Bookmark Manager' in Chrome it opens in a live tab and stays resident in that tab when you use it to open other URLs in new tabs. In Firefox, click to open a URL in a new tab and 'Wham', every time, the Bookmark Manager is gone. It is then a faff to open it again to find a different bookmark.
Unless I'm missing something, this involves opening the same Bookmark Manager in it's own window every time I want a bookmark, which seems ridiculous. If it persisted in its own window that would be something...
Is this correct? Is this a shortcoming and is there a fix for this please?
Thank you Ian
Solución elegida
The Bookmark Manager stays open here (on the regular Firefox). You can open bookmarks in a sidebar (ctl+b). You can also open bookmarks in a tab but you need to close that if you want to add, remove or edit (a) bookmark(s).
https://support.mozilla.org/en-US/kb/use-firefox-sidebar-access-bookmarks-history-synced
To show in a tab, enter this in the address bar (bookmark it if you want to reuse). chrome://browser/content/places/places.xhtml
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Solución elegida
The Bookmark Manager stays open here (on the regular Firefox). You can open bookmarks in a sidebar (ctl+b). You can also open bookmarks in a tab but you need to close that if you want to add, remove or edit (a) bookmark(s).
https://support.mozilla.org/en-US/kb/use-firefox-sidebar-access-bookmarks-history-synced
To show in a tab, enter this in the address bar (bookmark it if you want to reuse). chrome://browser/content/places/places.xhtml
Just the Ticket. Thank you Terry. Ian
- )
In the Bookmarks menu and in the Bookmarks Menu toolbar button drop-down list you can keep the list open by setting browser.bookmarks.openInTabClosesMenu = false on the about:config page.
You can drag the Bookmarks Menu button 
that shows the bookmarks in a drop-down list and drag the Library button that gives access to recent bookmarks and history from the Customize palette to the Navigation Toolbar.
The Bookmarks Menu button has a "View bookmarks sidebar" menu item.
See "How do I add the Bookmarks Menu button to the toolbar?"