Adblock Plus, popular extension for Firefox (available for Chrome, Opera and Internet Explorer browsers too) that blocks annoying ads on web got an update, it has added support for upcoming Australis theme. Since Mozilla ditched Add-on bar from Firefox new theme (know how to add it), now the extension developer has relocated ABP icon to navigation toolbar, you can hide it or show it by toggling check box next to ‘show in toolbar’ option of extension.
Adblock Plus now supports Australis
The version that got these changes is Adblock Plus 2.4.1. If you’re using ABP 2.4 or earlier versions, then visit Add-ons Manager in Firefox and select ‘Check for Updates’ from Gear menu which downloads and install updates for all extensions installed in browser.