etc/firefox/policies: add README.md

etc/firefox/policies/README.md

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+# Firefox `policies.json`
+
+The file is pretty self-explanatory, but I prefer Chromium way of handling
+enterprise policies since it allows me to cut them to multiple different files
+per whatever I am doing.
+
+<!-- editorconfig-checker-disable -->
+<!-- prettier-ignore-start -->
+
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+- [WARNING TO LIBREWOLF USERS](#warning-to-librewolf-users)
+- [Privacy Badger](#privacy-badger)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+<!-- prettier-ignore-end -->
+<!-- editorconfig-checker-enable -->
+
+## WARNING TO LIBREWOLF USERS
+
+This file takes priority over
+`/usr/share/librewolf/distribution/policies.json` so don't apply this or
+a lot of LibreWolf specific customizations stops being in force.
+
+## Privacy Badger
+
+- `jid1-MnnxcxisBPnSXQ-eff@jetpack` - Downloaded directly from EFF.
+
+Configured to learn locally and also in incognito as opposed to only relying
+on vendor list. Also not display the "Welcome to Privacy Badger screen".
+
+See also:
+
+- https://github.com/EFForg/privacybadger/blob/master/doc/admin-deployment.md
+- https://github.com/EFForg/privacybadger/blob/master/src/data/schema.json