Solved! A few days ago, on Facebook, I became unable to open any “About” tabs, even in my settings. No problem on my iPhone, just IPad.

[CEmerson]

Browser for both is Safari. Can’t open “About” tab in Facebook on iPad. Shared app on iPhone works.

 

[helpstar]

try reinstalling the apps
are you using any plugins/addons? Try running the apps in private mode or default mode.