Update README with instructions for new account setup.

README.md

@@ -54,3 +54,30 @@ apk add hunspell hunspell-en hunspell-en-us
 # Development
 apk add neovim pandoc git less make gcc musl-dev openssl-dev mandoc man-pages
 ```
+
+### Firefox
+
+I use the following Firefox extensions:
+
+- [ClearURLs](https://addons.mozilla.org/en-US/firefox/addon/clearurls/)
+- [Bypass Paywalls Clean](https://gitlab.com/magnolia1234/bypass-paywalls-firefox-clean)
+- [Nextcloud Passwords](https://addons.mozilla.org/en-US/firefox/addon/nextcloud-passwords)
+- [Plasma Integration](https://addons.mozilla.org/en-US/firefox/addon/plasma-integration/)
+- [uBlock Origin](https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/)
+
+### Files
+
+Theoretically, everything important that I care about should live in
+`~/Documents` and `~/Projects`, so I just have to copy those folders over to new
+systems.
+
+### Backup
+
+I use the following command to back up my stuff to my server, which then takes a
+ZFS snapshot for me:
+
+```
+rsync -av --delete --exclude .cache "$HOME/" server:$HOME/"
+```
+
+Eventually I will use ZFS on my laptop.