You can also install extension via the policies.json file:
It’s very simple really. You start with an empty file named policies.json and then you go through the github link above and add all the policies that matter to you.
You can see that for each policy they include instructions for Windows, MacOS and general policies.json. You want to look at the latter and copy what’s needed to your file.
If for example you want to install ublock, block cookies and disable a few other things (ie telemetry, studies, pocket) the policies.json file would like like the following:
policies.json
{
"policies": {
"Cookies": {
"AcceptThirdParty": "never",
"Behavior": "reject-tracker-and-partition-foreign",
"ExpireAtSessionEnd": true,
"Locked": false
},
"DisableFirefoxStudies": true,
"DisablePocket": true,
"DisableTelemetry": true,
"EnableTrackingProtection": {
"Value": true,
"Locked": false,
"Cryptomining": true,
"Fingerprinting": true
},
"Extensions": {
"Install": [
"https://addons.mozilla.org/firefox/downloads/latest/ublock-origin"
]
}
}
}