<p>Geany uses the configured browser command, which indeed <a href="/geany/geany/tree/master/src/keyfile.c#L90">defaults to <code>firefox</code></a>.  Some time ago when the setting had hard-coded fallbacks, <code>xdg-open</code> was added as the first alternative in <a href="https://github.com/geany/geany/commit/0d4cbd60a15a7d2bc8b45cb43633705584fdde98" class="commit-link"><tt>0d4cbd6</tt></a>.  Since then the setting has no hard-coded fallback and asks the user to revise the setting when it doesn't work.</p>

<p>Maybe using <code>xdg-open</code> as default could be sensible on non-Mac non-Windows, but I don't know the implications.</p>

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