Don't show AdBlock-Plus icon in add-on bar.

config/chroot_local-includes/etc/iceweasel/profile/chrome/userChrome.css

 /* Required, do not remove */
 @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
+/* Hide AdBlock-Plus button in the add-on bar */
+#abp-toolbarbutton { display: none; }
+
 /* Hide HTTPS Everywhere button in the toolbar */
 #https-everywhere-button { display: none; }
 

config/chroot_local-includes/etc/iceweasel/profile/user.js

 user_pref("capability.policy.maonoscript.javascript.enabled", "allAccess");
 user_pref("capability.policy.maonoscript.sites", " https://auk.riseup.net https://mail.riseup.net https://swift.riseup.net https://tern.riseup.net https://webmail.no-log.org addons.mozilla.org about: about:addons about:blank about:certerror about:config about:crashes about:credits about:home about:neterror about:plugins about:privatebrowsing about:sessionrestore chrome: file:// https://webmail.boum.org resource:");
 user_pref("extensions.adblockplus.currentVersion", "2.0.2");
+user_pref("extensions.adblockplus.showinaddonbar", false);
 user_pref("extensions.adblockplus.showintoolbar", false);
 user_pref("extensions.adblockplus.synchronizationinterval", 8766);