Not part of Firefox, you probably had an extension before perhaps called something like Plain old favorites or at least something with favorites in the name. If you have such a disabled extension you could try enabling it via the "Addon Compatibility Reporter" or with a simple configuration change.

Transferred "Favorites" from IE during the installation or using File > Import might be in a separate folder in your Bookmarks named "From Internet Explorer". See [https://support.mozilla.com/en-US/kb/Importing%20favorites%20and%20other%20data%20from%20Internet%20Explorer Importing favorites and other data from Internet Explorer] Info and more links about Bookmarks: [https://support.mozilla.com/en-US/kb/how-do-i-use-bookmarks?redirectlocale=en-US&redirectslug=Bookmarks How do I use Bookmarks?] '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''