I was a user of 'CustomizeGoogle' until I upgraded FF and needed to replace it - and found this...Good Work !
My biggest gripe with the goog monster is that HORRIBLE sidebar and no way to get back the classic search form.
Sadly OG cannot do this, so I also added SearchTweaker, which DOES do this thusly:
'Classic - Removes the sidebar, moves everything back to its original place: search bar, separator, and more'.
Uh-oh. Nightmare time !
It either is incompatible with OG or just plain crashy and it had to be removed (https://addons.mozilla.org/en-US/firefox/addon/161967/).
In addition to visual enhancements, this add-on also has some very useful things including Account Multi-Login, which would be even nicer than Google's own version - IF it worked !
I urge you to have a look at this other add-on and incorporate as many of it's features into yours as possible, STARTING with helping the world to have a saner search experience by helping folks to be RID of the awful, NEW layout they've stuffed in our faces.
Thanks !
mark