What exactly are you trying to do? Are you importing something from Yahoo, or from Internet Explorer?

If there are problems with importing the IE Favorites in Firefox then export the favorites in IE to an HTML file and import that file in the Firefox Bookmarks Manager. If you do not have the menu bar in IE then right-click the toolbar at the top to enable the Menu Bar. *Export the favorites in IE to an HTML file (bookmarks.html):<br>File > Import and Export *Import the HTML file in Firefox:<br>Bookmarks > Show All Bookmarks > Import & Backup > Import Bookmarks from HTML See "Import from another browser" and "Import from file": *http://kb.mozillazine.org/Import_bookmarks *https://support.mozilla.org/kb/how-do-i-use-bookmarks ---- In current Firefox releases (29 and later) the orange Firefox menu button has been replaced by the three-bar Firefox Menu button at the far right end of the Navigation Toolbar *There is a star like button next to the search bar on the Navigation Toolbar to bookmark the current web page and a "Show your bookmarks" button next to it to open the Bookmarks in a drop down menu.<br>You can find "Show All Bookmarks" to open the Bookmarks Manager (Library) at the bottom of this drop-down list *If you bookmark a page then "Bookmark This Page" in the Bookmarks menu changes to "Edit This Bookmark" *You can make the title bar visible via the "Title Bar" button at the bottom left in the Customize palette window It is still possible to have the Menu Bar visible via the right-click context menu of a toolbar to have menus like the File menu with Print (Ctrl+P) and Print Preview and the Bookmarks menu available. ----- Make sure that toolbars like the "Bookmarks Toolbar" are visible. *"3-bar" Firefox menu button > Customize > Show/Hide Toolbars *View > Toolbars<br>Tap the Alt key or press F10 to show the Menu Bar *Right-click empty toolbar area Open the Customize window and set which toolbar items to display. *"3-bar" Firefox menu button > Customize *check that "Bookmarks Toolbar items" is on the Bookmarks Toolbar *if "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the Customize palette into the Customize window to the Bookmarks Toolbar *if missing items are in the Customize palette then drag them back from the Customize window on the toolbar *if you do not see an item on a toolbar and in the Customize palette then click the "Restore Defaults" button to restore the default toolbar setup *https://support.mozilla.org/kb/customize-firefox-controls-buttons-and-toolbars

thank you for the information,all of my bookmarks are back where they belong.

thank you,it works.