Possible bug in iceweasel, can somebody please verify!

[Anubhav Yadav <anubhav@icoer.in>]

Hello list, 

I am using debian wheezy 7.1 stable, 64 bit and was previously using
google-chrome. But whenever I opened a new tab on chrome debian used to
freeze, (or I should say X used to freeze). I didn't had much time to
debug, so I removed it and switched to iceweasel which came with
debian. 

Now, there is an extension for firefox called buffer, and I installed
it, but it never showed on iceweasel. Can somebody please confirm this?
Here is the link to install buffer extension
(http://bufferapp.com/extensions) 

I tried to report this bug using reportbug program, but reportbug says
that there is a new version of iceweasel in unstable. Should I install
packages from unstable?

I want to install firefox, but I don't see any official mozilla
repository for debian. 

I was a chrome user for a long time, but the freezes on debian forced me
to switch to iceweasel. I also tried disabling the pepperflash plugin
for chrome.
-- 
Regards, 
Anubhav Yadav,
Computer Engineering Final Year Student,
Imperial College of Engineering and Research,
Pune.