So easy to use, unless you have a serious brain disability but in this case you should be in a specialized hospital (yep a read some 1 star reviews = UNBELIEVABLE about why they put 1 star!!!)
A top of the line add-on, strongly recommended!
Yes sure we would like more options in the user agent or more operating system and browsers choices, but it's just to be able to put more mess with websites who spy on us... I got an idea why not an input where we can input a "home made" user-agent ROTFL hahaha ;)
In all case this add-on spoof very well Instagram to upload pictures from your desktop computer, just select any smartphone, reload the page and you are set with the + tab/button at the bottom!!
Thanks a lot Alexander Schlarb, it's very good add-on