data can not be received correctly in Firefox 11

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Install firefox 11
2. Push the following data to browser
{"sender":"free51","senderid":"25517","d":"Chrome","text":"aaa","attach":[],"mid
":"24648-25517-30","date":"1333866053652"}
3. Browser has an error as follwing:
JSON转换异常:{time:1333866054401,data:"{\"sender\":\"free51\",\"senderid\":\
"25517\",\"d\":\"Chrome\",\"text\":\"aaa\",\"attach\":[],\"mid\":\"24648-25517-3
0\",\"date\":\"13338

What is the expected output? What do you see instead?
The expected output is incorrect. Seems Firefox 11 has truncated some data. 
Chrome works pretty well.

What version of the product are you using? On what operating system?
Latest version. Firefox 11 on windows XP

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 8 Apr 2012 at 6:29