Hey there!

Though there isn't a specific option that says "bookmark current page", it has the same function. If you right click on your current tab, you will see the option bookmark tab which essentially bookmarks the current page you're on.

Hope I helped!

Kind regards,

Bithiah

You can click the star on the location bar to bookmark the current page. Don't you see this star button ?

• https://support.mozilla.org/en-US/kb/bookmarks-firefox