useragent

Light has a different ua. It contains 'Light'. This may lead to security concerns.
There are ways to change it.

Ⅰ. add general.useragent.override with proper value in about:config

Ⅱ. use addons to change the useragent

Ⅲ. set general.useragent.show.appname to false. (Light 32 and above)

Just Google useragent to get more information.