Hi,

I want to install the firefox extension: "User Agent Swicher 0.6.8" which can be downloaded here: https://addons.mozilla.org/firefox/59/

When i click on "Install Now" it says next to the file name "Unsigned" in red.

I am suspicious because it says this extension is by Chris Pederick of http://chrispederick.com .

My question is why do i get this alert saying this is "unsigned", is windows just warning me that the software is a non-microsoft download and maybe unsafe or is mozilla warning me that they dont have any resposibility for the content because it was posted by a 3rd party?.

Could someone also explain to me why it is "Unsigned" and are there any risks in running this software even through it is listed on mozilla.org ?.