Well, just install the fucking extension in Firefox. There is nothing else that is as good as uBlock Origin. E.g. Reddit prevents you from reading unless you log in? There's a filter for that in an "annoyances" block-list that you can activate.
I cannot even begin to fathom that stupid fucking decision from someone above me.
When I pointed this out, they said "just ignore that part".
Nope LMAO!
Even so I would advise you to have the lawyers re-draft the entire thing.
Let the other side know, ensure you make the change clear and initial the change. 8f they sign the contract too, your change sticks
In my country, anyhow
It allows forcing specific extensions on, and allowing user installs is a flag.
I use the policy engine on nixos to install some plugins and disable some of firefox's dumber features.
...and this is/was the true Firefox way. You don't need to get some other browsers on the same engine made by shady companies. You have powerful plugins.