Do you not have a Star in the Address Bar ? Beside the 3 Dot Menu ?

If not : Please : https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer and https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles then https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Please let us know if this solved your issue or if need further assistance.

In case a picture is helpful:

It's possible to remove that star, but in that case it will be available on the ••• menu, and if you right-click it on that menu, you can add it back to the address bar.

Also:

There is a "real" bookmarks menu button for the toolbar. You can add it from Customize, or use the "Library" button as described in the article linked below:

• Customize Firefox controls, buttons and toolbars - look for

• Bookmarks in Firefox - section entitled: How do I add the Bookmarks Menu button to the toolbar?

Unfortunately, I'm not aware of a way to join the two buttons at the hip as they were in earlier versions of Firefox...