To easily create a Bookmark.
To create a bookmark just click on the small star located on the right side of the Address bar.Now edit the name to the bookmark and save the bookmark in a folder of your choice. You can also add tags for your bookmarks so that when you type the tag the website containing the tag is automatically loaded in the browser.
Note: If the star in the adress bar is white then you can understand that the page is not bookmarked. If it is filled with yellow color then the page is already bookmarked.

Searching Bookmarks in Firefox.
Go to the Bookmarks menu and click on the Organize bookmarks. Now enter the tag name or the name of the website you need to find.When the results are shown you can save the search results for future reference. Moreover if you bookmark a page that has a tag, URL, name, title , or keywords relevant to that search it is automatically added to that Search folder.This is helpful for you to bookmark as many pages as you can based on a particular topic you are intrested in.