keybindingskeyboard
I have a Macbook. Fn+Down/Up keys work as Page Down/Up in some applications but not in every application.
Some critical applications that this key binding don't work are Firefox and IntelliJ Idea.
Is there any way to make this key binding work in those applications?
If you can consider switching to the U.S layout, it's identical on Mac and Windows in terms of the positions of ASCII characters.
I don't know if there's a premade French PC layout, but you can also use Ukelele to create your own one:
/Library/Keyboard Layouts/ (the popovers shown when holding keys don't work with normal .keylayout files, and keyboard layouts in ~/Library/Keyboard Layouts/ can't be selected in password dialogs or the login window)To apply changes to a keylayout, you have to run sudo touch /Library/Keyboard Layouts/ (or modify the folder some other way) and log out and back in. You can disable the default French input source by editing the com.apple.HIToolbox plist.
Another option would be to use KeyRemap4MacBook:
You can customize the setting group by copying it from the source to private.xml.
It turns out the problem came from the external keyboard, a Logitech K750. I had to use the Logitech Control Center to get the correct behavior. Why this wasn't a problem in Mavericks, I'm not sure.
Best Answer
I just tested in my FF ver. 29.0.1 with Fn arrow UP and Down and it works on my MBA 10.9.3
More information on FF shortcuts.
For FF you can also customize the shortcuts.
I do not have the IntelliJ to test.
Some applications use the own keyboard shortcuts and override OS X settings.