Installing and tweaking Chromium on Mobian and Arch

[C0ffeeFreak]

After Chromium opens type chrome://flags in the address bar and hit enter. After it opens search for Freeze User-Agent request header and enable it then close the browser.

Open Chromium go to settings-more tools-extensions search for and install Use-Agent Switcher and Manager.

Open the extension and choose Chrome and Android in the drop down. Then select Chrome 87.0.4290.101  Android 10  and at the bottom left select Apply (all windows)

I'm trying this, and already had installed org.chromium.Chromium through flatpak. I've set the flags option and installed User-Agent Switcher and Manager. I think I got the right extension:

https://chrome.google.com/webstore/detai...bfkg?hl=en

However,  I'm not seeing a drop-down list of user agents to select from, only extension settings such as blacklist and whitelist mode. Is there a trick to getting to the dropdown, maybe it's hard to see on the Pinephone screen?

You have the correct extension. From the home screen select the extensions in the top bar (looks like a puzzle piece) and select the extension not the three dots on the side of it and you will see the selection drop down. You may have to make your selections in landscape mode until you get the mobile user agent string set.