QupZilla/qupzilla — pull request #624 by ff2000 (2012-10-27 11:39:20+00:00)
Title: Don't crash on adblock menu when adblock is disabled.

Whe adblock is disabled, the adblock-submenu from the contextmenu still queries custom filters on a NULL object. Only go in there when m_enabled is true.
(I was tempted to rename AdBlockIcon::setEnabled to something like setAbBlockEnabled, as setEnabled is inherited from QWidget)