Các câu trả lời gần đây cho Missing View --> Toolbars --> Tabs on top optionhttps://support.mozilla.org/vi/questions/9802542014-05-11T07:32:37-07:00The about:config option is no longer supported beginning with FF 29.0.1. Install the FF Classic The2014-05-11T07:32:37-07:00BirdieBobhttps://support.mozilla.org/vi/questions/980254#answer-573200<p>The about:config option is no longer supported beginning with FF 29.0.1. Install the FF Classic Theme Restorer add-on to put tabs on top or bottom, as well as restore other classic FF options if you wish.
</p>Current Firefox versions only show the "Tabs on Top" menu entry in the "View > Toolbars" and "Fir2013-12-12T17:35:57-08:00cor-elhttps://support.mozilla.org/vi/questions/980254#answer-511377<p>Current Firefox versions only show the "Tabs on Top" menu entry in the "View &gt; Toolbars" and "Firefox &gt; Options" menu and in toolbar context menus if the tabs aren't in the default position on top.
</p><p>If the tabs are on top and the menu entry isn't available and you want to move the tabs below the navigation toolbar then you need to toggle the browser.tabs.onTop pref to false on the about:config page.<br>
A Firefox restart is necessary to update the menu entry to either show or remove it.
</p><p>Note that this pref will no longer have effect when the Australis code lands on the release channel (the Australis code is currently only on the Nightly update channel).
</p>Or maybe it appears on the menu if you modify it from the default. That seems to ring a bell for som2013-12-12T08:58:46-08:00jscher2000https://support.mozilla.org/vi/questions/980254#answer-511242<p>Or maybe it appears on the menu if you modify it from the default. That seems to ring a bell for some reason.
</p>I think this was removed from the menu ages ago. Could it have been added on your other systems by a2013-12-12T08:57:40-08:00jscher2000https://support.mozilla.org/vi/questions/980254#answer-511241<p>I think this was removed from the menu ages ago. Could it have been added on your other systems by an extension?
</p><p>To switch this on and off without an extension, see the support article: <a href="/en-US/kb/how-to-make-new-firefox-look-like-old-firefox" rel="nofollow">How to make the new Firefox look like the old Firefox</a>
</p>