Comment 9 for bug 380196

> softwares that call a browser to open a link, should all start the latest installed version,

problem here is that alternatives dont solve the problem you are looking for a solution here.

also it "shouldnt start the latest", but it should start the "default". default can either be set by the distribution (shipping the link to right binary) or by user (currently using gnome preferred application dialog). Everything else is not going to be supported (except maybe some kde/xfce specific mechanism).