Scoundrel - not at all sure I understand quite what you're supposed to do on the command line in your link, but whatever I tried I was told there were no alternatives to 'browser', to 'opera', or in fact to any way round I changed the wording. It could well be I'm just not doing what you're supposed to do, but any help with it would be appreciated.
And Neal - where do I find .bashrc? I've searched in what seem to me to be the places it's likely to be with no luck. And if there's a 'Search' or 'Find' facility in LXDE I haven't come across it. Sorry, I seem like a real noob here.