That’s something you have to decide for yourself.
Instead, I can propose you a way to automatically install the extension in every Firefox instance, without having to create a profile in a dvm-template (to avoid profile fingerprinting).
If you’re using firefox-esr create a policy.json file in /etc/firefox-esr/policies/policy.json in your TemplateVM, with the following content:
{
"policies": {
"Extensions": {
"Install": [
"https://addons.mozilla.org/firefox/downloads/file/3923300/facebook_container-2.3.2-fx.xpi"
]
}
}
}
If it doesn’t work, try copying it also to /usr/lib/firefox-esr/distribution/policy.json
I wrote a more thorough explanation about policies here: How to install addons's or arkenfox profile in template vm so it is there in disposable vm? - #14 by BEBF738VD