Add xdg-open to the list of browsers

Try xdg-open first

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Applied, with modifications.

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The problem with trying firefox before xdg-open and htmlview is that if firefox is installed, it will be used and the user's browser choice (which he has set in GNOME, KDE, or using the $BROWSER environment variable, or perhaps by other means) is ignored. xdg-open and htmlview on the other hand will try to invoke the user's chosen browser. Because of that, I still suggest the order xdg-utils, htmlview, and only after them specific browsers - reopening for that.

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Yes, and fontforge will also look at the BROWSER environment variable, so if that is set the list order is irrelevant.

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But setting $BROWSER is much more rare than setting up one's preferences via a modern desktop environment's "preferred applications" or somesuch option.

Thanks.

I don't know when it happened, but the code is already in git.
Closing "pro forma".