The following is a "Fix/ Solution" that I have created that solves the problem for users of Safari Ver 5.1.10 that Google introduced recently where they now block older version of Safari from using the "Modern Style" layout and features of Google which they had been used to...
You can still use the "Modern Style" Google with Safari 5.1.10 via the "Develop/ User Agent/ Other" menu to switch to a "User Agent" that allows you to use the "Modern Google" however, there is no way to make this as the permanent "Default User Agent" in Safari 5.1.10 and it has to be done for each new tab you open and every time you startup Safari... which is not exactly good or helpful...
That's where this "Fix" solves that for you. This fix will make sure Safari 5.1.10 starts up and uses a custom "User Agent" that allows you to continue to use the "Modern Style" Google and not have to constantly change the "User Agent" via the "Develop" menu...
It also has the benefit over other methods that are about of using FireFox "User Agents" in that this fix creates a Mac specific "User agent" that means you get the correct pages from whatever it is you are accessing on the internet (The FireFox one causes some changes to graphics and page layout when used on a Mac)...
As long as you are certain you are using Safari Version 5.1.10 on a Mac running OSX 10.6.8 (Snow Leopard) and they are all fully updated as far as they can be then this fix should work for you (it already has for several thousand other Safari 5.1. 10 users whom have tried it)...
INSTRUCTIONS.... Safari Version 5.1.10 Fix To Restore The "Modern Style" Google...
IMPORTANT !!! --- MAKE SURE SAFARI ISN"T RUNNING ---
Download the following DMG which contains the "Fix" for Safari Ver 5.1.10...
http://www.mediafire.com/download/7wsl4n5siu7cphw/Safari_Ver_5.1.10_Google_Fix.d mg
When you open the DMG file you will see a window that looks like this...
IMPORTANT --- MAKE SURE SAFARI ISN"T RUNNING ---
STEP 1: Double click on the folder called "A" to open it...
STEP 2: From the new window that opens from folder "A" find the file called "Safari" and drag
it to your Desktop screen to make a copy of it (this is both for safekeeping and in case the "fix"
doesn't work for you so that you can still restore the original file)...
STEP 3: Drag the file from the downloaded DMG window called "Safari" onto the folder in the
same window called "A"...
Now start Safari as you would normally and if the fix has worked you should once again be seeing the
"Modern" look Google once again. You should copy/ move the original "Safari" file you copied to your
Desktop screen to a safe place for storage (Downloads or Documents for example) in case you ever
need or want to restore the original file to Safari at some pint in the future...
IMPORTANT:- If you're still seeing the old version of Google in Safari after trying this fix then
unfortunately it hasn't worked for you and you MUST replace/ put back the
original "Safari" file you copied to your Desktop screen...
This is simple to do and is achieved by simply dragging the original "Safari"
file you copied to your Desktop screen onto the "A" folder in the "Safari Fix"
window...
Happy Googling - MadFranko008 (2014)
PS: Thank you to HapptyTed for the comments... :-)