Created attachment 569360 [details]
The existent 'tab menu' panel will only permit a certain number of tabs, no more no less than the current screen-height before the panel bounces back. Any attempt to scroll down to reach the 'New Tab' button is denied.
Example, on my Galaxy SII I can only open 8 tabs.
Mozilla/5.0 (Android; Linux armv7l; rv:10.0a1) Gecko/20111025 Firefox/10.0a1
Samsung Galaxy SII (Android 2.3.4)
seems to be fixed by bug 696462
Samsung Nexus S (Android 2.3.6)