Code review comment for lp:~ivaldi/midori/tabby-about-sessions

Hm... this branch isn't finished yet (@"refactor about: pages" (status "Work in progress "))
I tried to remove "about-content", but it dosn't work without removing the "about:" pages code first.
(And I'm not sure if it's still needed afterwards.) -> lp:~ivaldi/midori/outsource-about-pages (work in progress)

(I guess I could change it to properties, but it has to work first ;)