Update: Maxthon 2.5.1.4075
Maxthon 2.5.1.4075 is now available for download.
Why the big version number jump, you’ll ask. Well, there’s something else wrapped inside this release beside a long list of fixes (I can’t help mentioning the “possibly fixed” changelog entries 
).
Starting with this version, tabs in Maxthon are really independent from each other, meaning that a frozen tab won’t cause the whole browser to become unresponsive. Such tabs can be closed or simply refreshed.
On the downside, I noticed a problem with moving Maxthon’s window around. Sometimes, when I “grab” the title bar with the mouse pointer and drag, it behaves like nothing happened, but when I release the mouse button, the window “jumps” to the new location. Strange 
Other glitches I’ve experienced:
- opening a new tab via CTRL-n causes the address bar to lose focus after 1 second, so to type something you have to re-select the field (by using the mouse or otherwise)
- no option to enable the window frame
- when maximized, Maxthon seems to go outside the desktop by 1 or 2 pixels on the right side of the screen (the vertical scrollbar for example is not visible completely)
Sorry guys.. but I’m downgrading to Maxthon 2.1.5.1250 for the time being 
exe installer, 4.95MB, MD5 sum: 2078C7CF1812643DA819380683F3F07E
* Redesigned browser framework and added new anti-freeze feature
[Plugin and External Tools]
* Improved plugin security. Security id is no longer accessible in max.src. Existing Script/HTML plugins are not affected, individual COM plugins could obtain the security id through a new putSecurityId method if necessary.
[Interface]
* Added clean browser history option in the exit confirmation dialog
* Added a save as option in Collector, support ANSI, Unicode, and UTF-8 txt format
* Added a notice window when cleaning browser history
* Fixed a GDI leakage when tab is dragged
* Fixed a favorites and RSS sidebar focus problem
* Fixed a Maximize problem in mult-monitor environment
* Fixed a Float Button position problem under Split View
* Fixed a RSS duplicate addition alert problem
* Fixed a freeze problem when the shadow of menu is clicked
* The URL of favorites is shown when mouse hover favorites sidebar
* The close button on the active tab now works on mouse released (previously when mouse pressed)
[Capture]
* Fixed problem capturing long web pages
[Others]
* Fixed a zoom problem under IE8
* Fixed a freeze problem when maxthon exits
* Fixed a Magic Fill auto fill problem
* Fixed problem opening .url shortcut
* Fixed some browser window focus problems
* Fixed some memory leakage problem
* Possibly fixed problem that browser frame may not be drawn
* Possibly fixed problem that browser window may go behind other windows when opening external url
* Improved page scrolling efficiency
* Web page zoom ratio is limited between 10% to 1000%