i recently found a malware that changes bitcoin addresses when copied to the hackers address so just watch out and check to make sure that the bitcoin address you copy comes out the same when you paste it 
it is safer to store your coins on a hardware wallet:
https://bitcointalk.org/index.php?topic=899253.0
Doesn't this malware work even if you use a Trezor for example? I guess that people should be always careful and double check. MyTrezor Web wallet works in the browser as well.
The truth of the matter is that everybody should be double checking are addresses changed. If anybody can have a copy of this malware for a $1, this means that this malware can become very widespread.