Your Bookmarks (and History) are stored in a single file, places. sqlite, in your Profile folder. To open your Profile folder, Help > Troubleshooting Information , then next to "Profile Directory" click the "Open Containing Folder" button to open the Profile Folder.

Turn on the Menu bar or Bookmarks toolbar , click More tools… and choose Customize toolbar…. Click the Toolbars dropdown menu at the bottom of the screen and choose the toolbars you want to display. Note: The Bookmarks Toolbar can be set to Always Show, Never Show, or Only Show on New Tab. Click the Done button.

Firefox may use more system resources if it's left open for long periods of time. A workaround for this is to periodically restart Firefox. You can configure Firefox to save your tabs and windows so that when you start it again, you can start where you left off.

Firefox is the name of the web browser and it does not do email like a email client. Mozilla does have email but it is not available to the public but their employees. Firefox is the name of the web browser and it does not do email like a email client.