Hi, if the bookmarks button is missing, open the 3-bar menu > Library > Bookmarks > Bookmarking tools, and click Add Bookmarks Menu to Toolbar. See [[Bookmarks in Firefox]]. If you don't see it on the toolbar, go to the 3-bar menu > Customize, and look for it in the palette, from where you can drag it to a toolbar. If the button is still missing, try clicking on Restore Defaults. (Whilst there, if you wish, you can also change the UI appearance in Themes and Density. More [[Customize Firefox controls, buttons and toolbars]]). To add a bookmark, from Firefox 57 Quantum, you now need to click the star at the right-hand end of the address bar. ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you!''