I think strace could be used here to get a clue of how Chrome is
selected.
$ strace -f -e trace=clone,execve apport-bug apport
I got trace like this:
......
[pid 9729] execve("/usr/bin/gnome-open", ["gnome-open",
"https://bugs.launchpad.net/ubunt"...], [/* 70 vars */]Process 9725 suspended)
= 0
......
[pid 9732] execve("/usr/bin/firefox", ["firefox",
"https://bugs.launchpad.net/ubunt"...], [/* 73 vars */]) = 0
......
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https://bugs.launchpad.net/bugs/875812
Title:
apport-bug starts Chrome instead of Firefox
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