[adventured]

> Since posting is not possible without installing the app, I never posted anything

You can post from eg desktop Chrome, without using the app. I routinely do this since I don't like installing FB apps on my phone. I often edit photos on my desktop prior to uploading, so it's just plain convenient.

Sign in on the desktop with Chrome. Go to your default home page (the person body icon). Right mouse click -> inspect page.

At the top, change the page to responsive, and set something like eg 680x680 as the dimensions for the page (you can drag resize to different dimensions). Now reload the page. It will present the standard mobile interface bar at the bottom of the page, including the ability to upload images (the plus icon within a box).

[forgotmypw]

Thanks for this insight. I will keep in mind if I ever decide to bother with Instagram again.

[wolco]

Would resizing the window smaller do the same?

[jobigoud]

Haven't tested but moving to resposive might trigger a user agent change.

Can the same be done on FF?

[333c]

Firefox has a mode where you can choose from a dropdown of phone/tablet types, and it will set your user agent and screen size appropriately. I believe it's called "Responsive Design Mode."

[jobigoud]

That worked, thanks.

Dev tools > Responsive Design Mode in the top right, then back on the main page, selected a phone model. I had to reload the page for it to show the phone version of the site.