To search for bookmarks:
Click the open-book icon at the left end of the bookmarks bar.
In the search bar above the list of bookmarks, click one of the buttons on the left.
To search in all the collections: Click All.
To search in a particular collection: Highlight the collection in the left column, and then click the button with the collection’s name.
Next to the magnifying glass in the search field, type a word or phrase. Results appear as you type.