For some unknown reason, the User Agent from my browser (Iceweasel) It doesn't show me which distribution I'm using specifically in the plugin that we recently activated here From linux.
I have already changed it as you can see, but the question is how did I do it? Simple:
1- We open a tab and type about: config and what I always say, they deceive Firefox / Iceweasel telling them that we won't get involved 
2- Right click on any value » New [New] » String [String] and we write:
general.useragent.override
3- Then we copy the following:
Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20100101 Debian Iceweasel/7.0.1
Obviously that is in my particular case. The funny thing is to see what happens when we put things like this:
Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Linux Mint/11 Chrome/11.0.696.57 Safari/534.16
Mozilla/5.0 (X11; Linux:Debian x86_32; rv:2.0b8pre) Gecko/20101011 Opera/10.0
We can try other variants 