If you do not want Firefox tabs under navigation bar or bookmark toolbar, you can move them on the top of screen( just under title bar). Firefox extension ‘Tabs on top’ allows you to place all open tabs on the top of your browser.

You can also get TabMixPlus addon to put tabs in multiple rows in Firefox. The ‘tabs on top’ addon works with Firefox 3.0 and above version of Firefox.
Get Tabs on Top Add-on
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