In such cases, it is most helpfull to use the Firefox Document Inspector, which is invoked using F12 or CTRL+SHIFT+I. With it, you can point the mouse to a document element and it shows you the (generated) HTML source code that corresponds to that element.

In the case of the sidebar, this would be the following HTML, which you can then manipulate using the usual WWW::Mechanize::Firefox methods:

<select class="lists" style="z-index: -1;" name="speciesList" multiple
+="" size="4"><option value="- Use All Species -"></option><option val
+ue="0"></option><option value="1"></option><option value="2"></option
+><option value="3"></option><option value="4"></option><option value=
+"5"></option><option value="6"></option><option value="7"></option><o
+ption value="8"></option><option value="9"></option><option value="10
+"></option><option value="11"></option><option value="12"></option><o
+ption value="13"></option><option value="14"></option><option value="
+15"></option><option value="16"></option><option value="17"></option>
+<option value="18"></option><option value="19"></option><option value
+="20"></option><option value="21"></option><option value="22"></optio
+n><option value="23"></option><option value="24"></option><option val
+ue="25"></option><option value="26"></option><option value="27"></opt
+ion><option value="28"></option><option value="-1"></option></select>

[download]

In reply to The Document Inspector, finding elements in page (Re^3: WWW::Mechanize::Firefox -- how to close firefox browser window) by Corion
in thread WWW::Mechanize::Firefox -- how to close firefox browser window by jbernest

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