Steps to reproduce the issue

ok I dont have a 1000 extensions installed, but I have faked having a handful installed (All called "Akeeba Backup" for this test.

The same issue we had in Mambo 4.5 onwards, users will install millions of extensions and then the extensions list causes issues in the menu structure that is nicely designed to handle a "few" but not to handle real world cases where "users" "use" the system with their Trillion Extensions all installed.

This leads to users being able to access my extension which is called ZzzImSleeping which is off the page, and inaccessible at the bottom of a menu

Expected result

A user experience that allows all billion installed extensions to show in the administrator menu in a pretty and useable way

In Joomla 3.5 there was a scroller, not pretty, but effective.

Actual result

Currently, when you scroll down on a 27" monitor you get a load of whitespace, and white on white menu text leads to "invisible" menu items.

Grab some popcorn and watch this movie in HD http://screenshot.myjoom.la/0K2G3l1P2K1W or the following low-res gif (cause github doesnt allow HD Movies!)

System information (as much as possible)

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