uBlock's menu doesn't apear when address bar is hidden

[Link-Satonaka]

I use pentadactyl, and hide most UI elements. I tried placing uBlock on the lower address bar, but quickly discovered that it will not work this way. For whatever reason, the firefox address bar must be visible for uBlock to show its menu.

[AlexVallat]

Duplicate of #720

Quick fix: set the about:config preference extensions.ublock.forceLegacyToolbarButton to true and restart the browser. Then use Customize to put the toolbar button wherever on whatever visible bit of UI you have left.