In Ubuntu (14.04) I find that the Firefox shortcut for downloads
Ctrl+J doesn't work.
Ctrl+J always takes me to the Firefox default home page (the one with the big Firefox logo in the middle and the search box underneath).
Other shortcuts such as
Ctrl+B, etc. work just fine. I find this very odd. It's been the case since the clean install, i.e. it can't be due to another application.
Why could this be happening? How can I resolve this, without getting a external plugin?