Is there any way that the rounded window corners can be disabled in OS X Lion (10.7.3) ?
Update: It's the bottom two corners that I have problem with as they show up even in full screen mode.
Tested on 10.7.3 & 10.7.4
To turn rounded corners off for all windows use the following command in Terminal.
To restore the rounded corners for all windows use the following command in Terminal.
NOTE: For this to take effect on already open applications those applications must be closed and reopened (this is why the commands above include killall Finder). Some Applications may interact differently once CoreUI is turned off.
ALSO: This does not affect the corners at the bottom of the window. They will still appear rounded. (As noted in comments by Daniel Lawson)
If you are not comfortable with the killall Finder being used in your command the steps can be taken to ensure the same result.
Step 1. (Turn off rounded corners)
Step 2. (Turn off rounded corners)
To restore the original rounded corners, simply use the same 2 Steps and replace the false found at the end of the command with true as shown in the following command.
Remember: It is very likely that as you update your OS the rounded corners will reappear. However, even after your next OS update, the same steps listed above are likely to function the same. :–)