Difference between Firefox Nightly on phone/tablet/new/old Android?

Hi,

How big is the difference of behaviour on various phone/tablet/browser engines?

I have a client project
The app is ok on our phone but not on his tablet (which is quite old. Android 7.1)

Same browser: Firefox nightly because we needed to tweak dom.storage.default_quota

Our Android device: https://www.whatismybrowser.com/w/NZBXM9R

His Android device:

WEB BROWSER AND PLATFORM:

## Firefox 87 on Android (Nougat)

Their web browser is up to date!

THEIR WEB BROWSER'S CAPABILITIES:
Is JavaScript enabled? Yes
Are Cookies enabled? Yes
Third-Party Cookies? Yes
Is Flash Installed? Not installed, or disabled.
Is Java Installed? Not installed, or disabled.

MORE INFO ABOUT THEIR SYSTEM:
IP Address 75.48.43.132
Location Atlanta, United States, Earth
(Approximate)
Computer Screen 600 x 960 pixels
24 bit
Browser Window Size 601 x 578 pixels
"Do Not Track" Setting Not enabled or not supported
Using Tor? No

THEIR WEB BROWSER'S TECHNICAL DETAILS:
Software Type Web Browser Hardware Type Mobile
Browser version (full) 87.0 Operating System version (full) 7.1.1
Layout Engine Gecko Gecko Version 87.0
Configured Language English Browser GMT Offset -05:00
Device Pixel Ratio 1 Navigator Platform Linux armv7l
OS / CPU Linux armv7l No. of logical CPU cores 4
Maximum Touch Points 5 WebGL Vendor ARM
WebGL Renderer Mali-T720

THEIR WEB BROWSER'S USER AGENT:

Mozilla/5.0 (Android 7.1.1; Mobile; rv:87.0) Gecko/87.0 Firefox/87.0

I’ll see if we can try to replicate a small test case. But thought I’d post on the forum and see if others have any experience?

Thanks
ZubairLK

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