Is browser cross-contamination between VM qubes possible?

Yes, because each will have its own dedicated email alias and/or email account

I am not even sure I will have my mom use the mail client, as she might do best with the web portal to such the only issue is some of the web based email providers may not suffice in stopping Beacon attacks that tag which may fingerprint the qube appVM itself if it remains persistent — then again that is why 2 out of the 3 are going to be disposable

I don’t think my mom will be happy about the clipboard, which is also why I figured to have dedicated alias emails associated with her activity per each qube included

The idea is banking will be banking stuff, but it will not be her 2FA (I do have a different qube appVM for just 2FA)

See:

Image Description:
– START IMAGE DESCRIPTION –

Top separate qube appVM is a different color, green, while the 3 bellow are a charcoal dark gray.

0 QUBES 3D square image =
1 side says the OS minimum requirements,
“16G RAM, 250G hard disk”

The top side describes its appVM config as,
“Persistent Storage [with a thick red question mark as I don’t know the RAM or disk allocation yet I will give it]”

The final 3rd facing front side has install and functional descriptors as,
“[bullet point] 2FA / MFA” then goes on to list the software installed,
“[package box icon] [redacted] app 2FA
[package box icon] [redacted] OTP
[package box icon] Authy”

Bellow are the charcoal gray qubed box shapes:

3 qubes representing the appVMs from the Templated base iso image of an OS.

1st QUBED 3D square image =

1 side says the OS minimum requirements,
“4G RAM, 15G hard disk”

The top side describes its appVM config as,
“Disposable 8G RAM, 5G hard disk”

The final 3rd facing front side has install and functional descriptors as,
“[bullet point] Banking” then goes on to list the software installed,
“[package box icon] Libre Wolf
[package box icon] Thunderbird
[package box icon] Libre Office”

2nd QUBED 3D square image =

1 side says the OS minimum requirements,
“4G RAM, 15G hard disk”

The top side describes its appVM config as,
“Disposable 8G RAM, 5G hard disk”

The final 3rd facing front side has install and functional descriptors as,
“[bullet point] Finance” then goes on to list the software installed,
“[package box icon] Libre Wolf
[package box icon] Thunderbird
[package box icon] Libre Office”

3rd (last) QUBED 3D square image =

1 side says the OS minimum requirements,
“4G RAM, 15G hard disk”

The top side describes its appVM config as,
“[in bold red letters] Persistent [end of bold red letters] 8G RAM, 5G hard disk”

The final 3rd facing front side has install and functional descriptors as,
“[bullet point] IRS / Taxes” then goes on to list the software installed,
“[package box icon] Libre Wolf
[package box icon] Thunderbird
[package box icon] Libre Office”

• NOTE:
The mention of the OS for the Template was redacted in all 3 qube appVM image depictions

– END OF IMAGE DESCRIPTION –