I´m install 2.5.8 on KDXG = not mail yahoo now
I'm pretty angry with Amazon, I trust them, I bought an expensive graphite kindle 3G DX free, I bought books, I bought newspapers, and
first I had to see how the option would disappear browser to navigate between pages (if you try to enter a link that opens another window, the browser does nothing stands still, and in the Kindle 3 warns that multiple window mode is not supported, but when the unit was new if supported)
I clearly remember any news or click on link and opened the page in question, even if not in the same domain.
(If you wanted back then was only a matter of using the back button, and previous history cache +)
Now that's not possible that much of this close/limted navigation, making unbearable visit pages that use links as external reference to another window.
If you try clic on some links don´t do nothing ¡ and on K3 say that not multiple windows, BUT on 2010-09 and 2010-12 was posible do that.
(only need permit send this link to bar url and close previos windows, not need two windows to permit do that ¡¡¡)
When I buy kindle dx I CAN DO THAT ¡ webkit supported that ¡
This is new block...
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And also now I can not see THE YAHOO MAIL on the kindle DX G 
Yesterday installed the latest version 2.5.8 and now I get these warnings when I try to access mail.!
WARNING for all you:
Do not upgrade, the latest versions only serve to remove options to customers and place limitations. 
You know how I can turn back to 2.5.5? I copied the entire drive, including hidden files to your computer, can be of any use some of this?
I want the webkit browser that originally had no non-blocking filters.
Before it could, why not now? ... Clearly handwrite the address on url bar is not practical, and these functions were useful.
(BTW, why do we have to have a very limited options, pdf's, configurations, etc, if it appears that with the hardware if it is possible to do something better?, exits other options that show powefull system operate...)
In short, I am very angry with Amazon, I have been fooled by the latest RESTATEMENT firmware.
PS: I hope this mail will be helpful to someone, to me, it no longer.
And also hope that many complaints are sent emails from amazon.
Greetings