How do I change the user agent reported by my Kindle Fire's browser? If I can't, is there a third-party browser for Fire that lets you do this?

I have a Fire tablet too. I use Firefox for a browser on it. In Firefox if you click the three vertical dots in the upper right there is a option to show desktop site. If you select this it is persistent.

Since it is a Fire tablet you don’t have access to the google play store. So you will need to manually install the APK from here:

https://download.mozilla.org/?product=fennec-latest&os=android&lang=multi

From the silk browser it will ask you if you want to install and give you a warning. Just say yes.

I don’t remember if this is necessary but you might have to enable sideloading of APKs.

Instructions here.

And I would install this once you get firefox working. It makes things much nicer.

Brilliant! This was easy!

(Also, johnpowell, you are the prince of computer help here… This is like the fifth time you’ve helped me or my family and we haven’t even asked that many questions!)

(note for any future readers: it may not install totally automatically – I had to go to Docs/Downloads and click on that fennec file, but that’s all it takes)