hello, you appear to have a very outdated version of firefox installed - please download the current firefox 51 (with the menu button) at https://www.mozilla.org/firefox

The The System Details list next to the question shows you used Firefox 12 on Windows 8, but you state that you use Windows 10.

• User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0

Did you use an other computer to post this question?

• Current Firefox releases have the three-bar Firefox Menu button at the 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.
• You can find "Show All Bookmarks" to open the Bookmarks Manager (Library) at near the top of the drop-down list.
• If the current page is bookmarked then "Bookmark This Page" in the Bookmarks menu as well as the tooltip of the star changes to "Edit This Bookmark".

You can toggle the title bar on/off via the "Title Bar" button at the bottom left in the Customize palette window. You can make the Menu Bar visible via the right-click context menu of a toolbar or via "Customize -> Show/Hide Toolbars" to have the menu bar with the File and Edit and Bookmarks and History and Tools menus.

Thanks, sorted